Sea to Summit Camp Plus Self Inflating Rectangular Wide Mat
The Camp Plus S.I. is designed to provide maximum comfort to those who are looking for a versatile all-round sleeping mat. The combination of robust and durable 75D fabric with the unique Delta Cores technology allows Sea to Summit to remove over 40% of foam and create a compact sleeping mat. The Camp Plus S.I. is thicker than the original Camp Mat S.I. and features horizontal Delta Cores. It offers high quality, durability and comfort. The use of 75D polyester provides a harder, more abrasion resistant base, while the Camp Plus S.I., with a thickness of 7.5 cm, provides sufficient cushioning even for lanky hips. The high R-value of 4.3 also means you can use it all year round. All Sea to Summit's self-inflating mats feature the unique, multifunctional single valve that was developed specifically for self-inflating mats. No more fighting against re-inflation when rolling up the mat! Available in two narrow bottom sizes and two wider rectangular sizes.
The Camp Plus S.I. is designed to provide maximum comfort to those who are looking for a versatile all-round sleeping mat. The combination of robust and durable 75D fabric with the unique Delta Cores technology allows Sea to Summit to remove over 40% of foam and create a compact sleeping mat. The Camp Plus S.I. is thicker than the original Camp Mat S.I. and features horizontal Delta Cores. It offers high quality, durability and comfort. The use of 75D polyester provides a harder, more abrasion resistant base, while the Camp Plus S.I., with a thickness of 7.5 cm, provides sufficient cushioning even for lanky hips. The high R-value of 4.3 also means you can use it all year round. All Sea to Summit's self-inflating mats feature the unique, multifunctional single valve that was developed specifically for self-inflating mats. No more fighting against re-inflation when rolling up the mat! Available in two narrow bottom sizes and two wider rectangular sizes.
The Camp Plus S.I. is designed to provide maximum comfort to those who are looking for a versatile all-round sleeping mat. The combination of robust and durable 75D fabric with the unique Delta Cores technology allows Sea to Summit to remove over 40% of foam and create a compact sleeping mat. The Camp Plus S.I. is thicker than the original Camp Mat S.I. and features horizontal Delta Cores. It offers high quality, durability and comfort. The use of 75D polyester provides a harder, more abrasion resistant base, while the Camp Plus S.I., with a thickness of 7.5 cm, provides sufficient cushioning even for lanky hips. The high R-value of 4.3 also means you can use it all year round. All Sea to Summit's self-inflating mats feature the unique, multifunctional single valve that was developed specifically for self-inflating mats. No more fighting against re-inflation when rolling up the mat! Available in two narrow bottom sizes and two wider rectangular sizes.
The Camp Plus S.I. is designed to provide maximum comfort to those who are looking for a versatile all-round sleeping mat. The combination of robust and durable 75D fabric with the unique Delta Cores technology allows Sea to Summit to remove over 40% of foam and create a compact sleeping mat. The Camp Plus S.I. is thicker than the original Camp Mat S.I. and features horizontal Delta Cores. It offers high quality, durability and comfort. The use of 75D polyester provides a harder, more abrasion resistant base, while the Camp Plus S.I., with a thickness of 7.5 cm, provides sufficient cushioning even for lanky hips. The high R-value of 4.3 also means you can use it all year round. All Sea to Summit's self-inflating mats feature the unique, multifunctional single valve that was developed specifically for self-inflating mats. No more fighting against re-inflation when rolling up the mat! Available in two narrow bottom sizes and two wider rectangular sizes.
in 5 offers
The lowest price for Sea to Summit Camp Plus Self Inflating Rectangular Wide Mat right now is $179.00 at Down Under Camping, compared across 5 retailers.
The all-time low was $80.23 on 9 May 2026 — today's price is 123% above the lowest ever. It has been notably cheaper before — worth setting a price alert.
Prices last updated 1 July 2026.
Last updated at 01/07/2026 13:14:58
Sea to Summit - Camp Plus Self Inflating Sleeping Mat - Thick & Warm Sleeping Mat - Repair Kit & Pillow Lock System - 4 Seasons - Camping - Green
Free delivery
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Sea To Summit Camp Plus Self-Inflating Sleeping Mat - Rectangular Wide
Camp Plus SI Rectangle Wide
Free delivery
Sea to Summit Camp Plus Self-Inflating Sleeping Mat RECTANGULAR WIDE / Green
Delivery between 6–13 July $35
Sea To Summit Camp Plus Rectangular Self Inflating Mat (Regular Wide)
originally posted on REI
I was looking for a sleeping pad that had certain specifications. This ended up as my top pick after many hours of looking at every sleeping pad on the market that I could find that met these specifications and was under $140. In short... it is compact, has foam and air for r-value - comfort - and compactability, it is 3 inches thick which is enough so you don't touch the ground, it is long enough for a 6 ft person and a pillow, it has a high r-value of 4.3 which is good for most temperatures year-round (except perhaps snow). It seems fairly durable and does not make a lot of noise when sleeping on it as some other brands do. It is wide enough to lay with your hands at your side but not extra wide. It is fairly lightweight and can support a lot of weight. It can be ... MoreI was looking for a sleeping pad that had certain specifications. This ended up as my top pick after many hours of looking at every sleeping pad on the market that I could find that met these specifications and was under $140. In short... it is compact, has foam and air for r-value - comfort - and compactability, it is 3 inches thick which is enough so you don't touch the ground, it is long enough for a 6 ft person and a pillow, it has a high r-value of 4.3 which is good for most temperatures year-round (except perhaps snow). It seems fairly durable and does not make a lot of noise when sleeping on it as some other brands do. It is wide enough to lay with your hands at your side but not extra wide. It is fairly lightweight and can support a lot of weight. It can be used for camping and backpacking (although it is the widest (when packed) pad I would recommend for backpacking). I do not like pads that when packed are longer than your backpack... I like this pad because it is not long when packed. It has a 3 in 1 valve for fast inflation/deflation, inflating without deflating when you stop, and deflating without inflating when you stop. You can buy a separately sold compatible air pump sack by Sea to Summit for inflation without electricity or breathing a lot... and using it instead of your breath introduces less moisture into the pad - which can lower the r-value and cause mold.Few downsides:I would like it more if it was less wide and overall smaller - both in regards to packed dimensions... but that may be difficult to design and use materials that result in a higher cost. I like that is is wide instead of long.It is the most difficult pad I have rolled when packing it up... but it is still doable.I would have liked if it came with a bag/sack that could easily be secured well to the outside of most backpacks - and if it was rain-proof.If it wasn't obvious this in not the pad for ultralight backpackers, but if you want these specs under $140 this is compact and the #1 I found.(The next best pad #2 which I will not list here is about 2 inches less wide and 2 inches wider when packed - it however is less wide unfolded and and unnecessarily thick) (a top pick but further down on the list is very compact however it is noisy and has an unreliable R-value due to its design)
originally posted on seatosummitusa.com
I purchased 1 pad and then liked it so I got 1 more - both in the last month from REI. I plan on getting 2 more soon.I was looking for a sleeping pad that had certain specifications. This ended up as my top pick after many hours of looking at every sleeping pad on the market that I could find that met these specifications and was under $140. In short... it is compact, has foam and air for r-value - comfort - and compactability, it is 3 inches thick which is enough so you don't touch the ground, it is long enough for a 6 ft person and a pillow, it has a high r-value of 4.3 which is good for most temperatures year-round (except perhaps snow). It seems fairly durable and does not make a lot of noise when sleeping on it as some other brands do. It is wide enough to lay ... MoreI purchased 1 pad and then liked it so I got 1 more - both in the last month from REI. I plan on getting 2 more soon.I was looking for a sleeping pad that had certain specifications. This ended up as my top pick after many hours of looking at every sleeping pad on the market that I could find that met these specifications and was under $140. In short... it is compact, has foam and air for r-value - comfort - and compactability, it is 3 inches thick which is enough so you don't touch the ground, it is long enough for a 6 ft person and a pillow, it has a high r-value of 4.3 which is good for most temperatures year-round (except perhaps snow). It seems fairly durable and does not make a lot of noise when sleeping on it as some other brands do. It is wide enough to lay with your hands at your side but not extra wide. It is fairly lightweight and can support a lot of weight. It can be used for camping and backpacking (although it is the widest (when packed) pad I would recommend for backpacking). I do not like pads that when packed are longer than your backpack... I like this pad because it is not long when packed. It has a 3 in 1 valve for fast inflation/deflation, inflating without deflating when you stop, and deflating without inflating when you stop. You can buy a separately sold compatible air pump sack by Sea to Summit for inflation without electricity or breathing a lot... and using it instead of your breath introduces less moisture into the pad - which can lower the r-value and cause mold.Few downsides:I would like it more if it was less wide and overall smaller - both in regards to packed dimensions... but that may be difficult to design and use materials that result in a higher cost. I like that is is wide instead of long.It is the most difficult pad I have rolled when packing it up... but it is still doable.I would have liked if it came with a bag/sack that could easily be secured to the outside of most backpacks - and if it was rain-proof.If it wasn't obvious this in not the pad for ultralight backpackers, but if you want these specs under $140 this is compact and the #1 I found.(The next best pad #2 which I will not list here is about 2 inches less wide and 2 inches wider when packed - it however is less wide unfolded and and unnecessarily thick) (a top pick but further down on the list is very compact however it is noisy and has an unreliable R-value due to its design)
originally posted on REI
I really like the valve, it makes it easy to deflate and also being able to adjust the amount of air while laying on it makes it easy to get it just right. As a heavyer user I was a bit worried that my hips would hit the ground, but this is not a problem at all. The wide version is also great for plus size users. I found it very comfortable and was not cold during the night, though I have only used it during summer so no temperatures below approximately 50 F yet.I inflated it before use for a couple of days and found that this helped a lot with inflation later. The first inflation was slow (as expected), but later ones were better. I also got the pump sack from sea to summit to top it off, and since it doubles as a dry sack it adds no bulk.
| Seasons | 3+ |
| Thickness | 7.5 cm |
| R-Value | 4.3 |
| Pack size | 20.4 x 34 cm |
| Dimensions | 183 x 64 cm |
Sea to Summit - Camp Plus Self Inflating Sleeping Mat - Thick & Warm Sleeping Mat - Repair Kit & Pillow Lock System - 4 Seasons - Camping - Green
Free delivery
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
Sea To Summit Camp Plus Self-Inflating Sleeping Mat - Rectangular Wide
Camp Plus SI Rectangle Wide
Free delivery
Sea to Summit Camp Plus Self-Inflating Sleeping Mat RECTANGULAR WIDE / Green
Delivery between 6–13 July $35
Sea To Summit Camp Plus Rectangular Self Inflating Mat (Regular Wide)
I was looking for a sleeping pad that had certain specifications. This ended up as my top pick after many hours of looking at every sleeping pad on the market that I could find that met these specifications and was under $140. In short... it is compact, has foam and air for r-value - comfort - and compactability, it is 3 inches thick which is enough so you don't touch the ground, it is long enough for a 6 ft person and a pillow, it has a high r-value of 4.3 which is good for most temperatures year-round (except perhaps snow). It seems fairly durable and does not make a lot of noise when sleeping on it as some other brands do. It is wide enough to lay with your hands at your side but not extra wide. It is fairly lightweight and can support a lot of weight. It can be ... MoreI was looking for a sleeping pad that had certain specifications. This ended up as my top pick after many hours of looking at every sleeping pad on the market that I could find that met these specifications and was under $140. In short... it is compact, has foam and air for r-value - comfort - and compactability, it is 3 inches thick which is enough so you don't touch the ground, it is long enough for a 6 ft person and a pillow, it has a high r-value of 4.3 which is good for most temperatures year-round (except perhaps snow). It seems fairly durable and does not make a lot of noise when sleeping on it as some other brands do. It is wide enough to lay with your hands at your side but not extra wide. It is fairly lightweight and can support a lot of weight. It can be used for camping and backpacking (although it is the widest (when packed) pad I would recommend for backpacking). I do not like pads that when packed are longer than your backpack... I like this pad because it is not long when packed. It has a 3 in 1 valve for fast inflation/deflation, inflating without deflating when you stop, and deflating without inflating when you stop. You can buy a separately sold compatible air pump sack by Sea to Summit for inflation without electricity or breathing a lot... and using it instead of your breath introduces less moisture into the pad - which can lower the r-value and cause mold.Few downsides:I would like it more if it was less wide and overall smaller - both in regards to packed dimensions... but that may be difficult to design and use materials that result in a higher cost. I like that is is wide instead of long.It is the most difficult pad I have rolled when packing it up... but it is still doable.I would have liked if it came with a bag/sack that could easily be secured well to the outside of most backpacks - and if it was rain-proof.If it wasn't obvious this in not the pad for ultralight backpackers, but if you want these specs under $140 this is compact and the #1 I found.(The next best pad #2 which I will not list here is about 2 inches less wide and 2 inches wider when packed - it however is less wide unfolded and and unnecessarily thick) (a top pick but further down on the list is very compact however it is noisy and has an unreliable R-value due to its design)
I purchased 1 pad and then liked it so I got 1 more - both in the last month from REI. I plan on getting 2 more soon.I was looking for a sleeping pad that had certain specifications. This ended up as my top pick after many hours of looking at every sleeping pad on the market that I could find that met these specifications and was under $140. In short... it is compact, has foam and air for r-value - comfort - and compactability, it is 3 inches thick which is enough so you don't touch the ground, it is long enough for a 6 ft person and a pillow, it has a high r-value of 4.3 which is good for most temperatures year-round (except perhaps snow). It seems fairly durable and does not make a lot of noise when sleeping on it as some other brands do. It is wide enough to lay ... MoreI purchased 1 pad and then liked it so I got 1 more - both in the last month from REI. I plan on getting 2 more soon.I was looking for a sleeping pad that had certain specifications. This ended up as my top pick after many hours of looking at every sleeping pad on the market that I could find that met these specifications and was under $140. In short... it is compact, has foam and air for r-value - comfort - and compactability, it is 3 inches thick which is enough so you don't touch the ground, it is long enough for a 6 ft person and a pillow, it has a high r-value of 4.3 which is good for most temperatures year-round (except perhaps snow). It seems fairly durable and does not make a lot of noise when sleeping on it as some other brands do. It is wide enough to lay with your hands at your side but not extra wide. It is fairly lightweight and can support a lot of weight. It can be used for camping and backpacking (although it is the widest (when packed) pad I would recommend for backpacking). I do not like pads that when packed are longer than your backpack... I like this pad because it is not long when packed. It has a 3 in 1 valve for fast inflation/deflation, inflating without deflating when you stop, and deflating without inflating when you stop. You can buy a separately sold compatible air pump sack by Sea to Summit for inflation without electricity or breathing a lot... and using it instead of your breath introduces less moisture into the pad - which can lower the r-value and cause mold.Few downsides:I would like it more if it was less wide and overall smaller - both in regards to packed dimensions... but that may be difficult to design and use materials that result in a higher cost. I like that is is wide instead of long.It is the most difficult pad I have rolled when packing it up... but it is still doable.I would have liked if it came with a bag/sack that could easily be secured to the outside of most backpacks - and if it was rain-proof.If it wasn't obvious this in not the pad for ultralight backpackers, but if you want these specs under $140 this is compact and the #1 I found.(The next best pad #2 which I will not list here is about 2 inches less wide and 2 inches wider when packed - it however is less wide unfolded and and unnecessarily thick) (a top pick but further down on the list is very compact however it is noisy and has an unreliable R-value due to its design)
I really like the valve, it makes it easy to deflate and also being able to adjust the amount of air while laying on it makes it easy to get it just right. As a heavyer user I was a bit worried that my hips would hit the ground, but this is not a problem at all. The wide version is also great for plus size users. I found it very comfortable and was not cold during the night, though I have only used it during summer so no temperatures below approximately 50 F yet.I inflated it before use for a couple of days and found that this helped a lot with inflation later. The first inflation was slow (as expected), but later ones were better. I also got the pump sack from sea to summit to top it off, and since it doubles as a dry sack it adds no bulk.
I got this because I'm a side-sleeper with significant hip/shoulder contours, and I'm coming back to camping in my early 40s. I haven't camped since I was a kid, and am new to the concept of having a sleeping pad at all. For the first trip, I just used a yoga mat, and as an adult side-sleeper that was definitely not going to cut it. So I sprung for this sleeping pad. This was plush, really supported my hips and shoulders, and really helped a lot. No aches and pains from sleeping this time. It got down to the 50s and I felt no cold from the floor. The second night the old tent leaked a bit, but the pad kept me well out of the moisture on the floor. I was also pleased that it dried quickly and easily at home. The best part is that when I first tested it at home, my ... MoreI got this because I'm a side-sleeper with significant hip/shoulder contours, and I'm coming back to camping in my early 40s. I haven't camped since I was a kid, and am new to the concept of having a sleeping pad at all. For the first trip, I just used a yoga mat, and as an adult side-sleeper that was definitely not going to cut it. So I sprung for this sleeping pad. This was plush, really supported my hips and shoulders, and really helped a lot. No aches and pains from sleeping this time. It got down to the 50s and I felt no cold from the floor. The second night the old tent leaked a bit, but the pad kept me well out of the moisture on the floor. I was also pleased that it dried quickly and easily at home. The best part is that when I first tested it at home, my husband was so impressed with how comfy it was, that he actually agreed to go camping with me next time. So I bought a second one for him, and we'll see what he thinks of it in practice soon. Last, it's really easy to inflate - it does most of the work for you with an intuitive valve system and self-inflating foam. It was easy to give it a few puffs to get it to a nice level of additional squish.
Very comfortable. We are side sleepers and these were great for my husband (200lb) teenager and myself (140lb). I loved that they did not slide off the cot too. VERY easy to deflate and pack up. The deflate valve is so helpful for preventing air to get back in. The inflate was not as fast or good as I would like it. We followed S2S instructions for prepping it before first use and left them inflated for 3 days before taking on our trip. We used our air pump to help move it along, but I’m sure with subsequent use the self inflating will get better.
Bought two, one didn’t hold air well from the start. They are not really “self-inflating” unless you want to jump through hoops. This to be expected and is just like most other cheap self inflating mats. After a couple trips with them, neither holds air overnight. REI will not accept the return because their “100% satisfaction” is for 365 days now. I waited to return until I had another reason to visit rei store which happened to be 15months from purchase. Extremely frustrating, might as well order from somewhere else.
I’ve been using the Sea to Summit Comfort Light SI sleeping pad for the past year, about 50 nights of camping, but found the 2 inches of pad thickness not quite sufficient for my side sleeping requirements. I liked everything else about this pad including the foam core construction, inflation/deflation valve system and durability, so when I discovered this 3 inch Camp Plus SI version offered by Sea to Summit I decided to give it a try. Since I typically drive my SUV to camping destinations and weight is not a huge concern, I chose the large rectangular option. I have been very impressed with this purchase. The pad is truly the first pad that I’ve ever had that will self-inflate. After the initial breaking-in period as suggested by the manufacturer, the pad ... MoreI’ve been using the Sea to Summit Comfort Light SI sleeping pad for the past year, about 50 nights of camping, but found the 2 inches of pad thickness not quite sufficient for my side sleeping requirements. I liked everything else about this pad including the foam core construction, inflation/deflation valve system and durability, so when I discovered this 3 inch Camp Plus SI version offered by Sea to Summit I decided to give it a try. Since I typically drive my SUV to camping destinations and weight is not a huge concern, I chose the large rectangular option. I have been very impressed with this purchase. The pad is truly the first pad that I’ve ever had that will self-inflate. After the initial breaking-in period as suggested by the manufacturer, the pad sufficiently inflates on its own to my comfort level without adding a single puff. The sleeping comfort was sufficiently improved over my 2 inch pad and totally worth the investment. An unexpected bonus was the storage bag, which was much improved over the Comfort Light SI bag, which was a real struggle to fold and return to the bag. The new Camp Plus SI bag is sized appropriately for the pad and has additional cinch drawstrings to further compress the contents.Overall I am thrilled with the Camp Plus SI sleeping pad by Sea to Summit and suggest you give it a try if you’re in the market.
It's supposed to be a self-inflating mat, but even after hours with the valve in the inflate position, the mat was still looking like a pancake. I tried for 3 days. So...it doesn't self-inflate. I decided to blow air by mouth, but I really, really hate to do this as it makes me want to barf. The mat doesn't just need a couple of blows, but way too many. The mat held air after I blew into it for a long time. After calling REI, a nice rep told me to try a pump. I had a pump for an air mattress and decided to try on the Sea to Summit. The air hose didn't fit 100% but was good enough. I filled the mat with air but here is the problem: when removing the hose, the air rushed out of the mat and that's because the hose can only fit into the open hole, not the gridded orange ... MoreIt's supposed to be a self-inflating mat, but even after hours with the valve in the inflate position, the mat was still looking like a pancake. I tried for 3 days. So...it doesn't self-inflate. I decided to blow air by mouth, but I really, really hate to do this as it makes me want to barf. The mat doesn't just need a couple of blows, but way too many. The mat held air after I blew into it for a long time. After calling REI, a nice rep told me to try a pump. I had a pump for an air mattress and decided to try on the Sea to Summit. The air hose didn't fit 100% but was good enough. I filled the mat with air but here is the problem: when removing the hose, the air rushed out of the mat and that's because the hose can only fit into the open hole, not the gridded orange plug.I am disgusted with the so-called new fantastic technology. I used to have Therm-a-rest mats that would inflate 90% without blowing air into them. Blowing air meant touching up, not blowing until you get nauseated. I got this for car camping, but car camping might take me at higher elevations sometimes and I hate to think how it feels when blowing my mouth for 5 solid minutes. This is nonsense and I think I will return it. I now come to think that I don't need a brand name for such a lousy product. I did see $30-40 self-inflating mats that are probably exactly the same. In that case I can accept the limitations. I wanted something functional, not lousy product that is called brand name. I'm really frustrated by this experience.
Does not even begin to self inflate even after 15 minutes with valve completely open. REQUIRES complete manual inflation. Actual width when inflated is 24" not 25". Actual depth measured with calipers is 2.4" not 3". Still, this appears sturdy, useful and comfortable as a car camping pad. Please correct specs.Update: left inflated for a few days. Now self inflates most of the way by itself.
For the longest time I’ve used leaf litter and other natural materials to improve my sleeping comfort on the trail. Old habits die hard thanks to Uncle Sam. However I decided it was time to invest in an actual pad.I almost didn’t buy it because I read it was a bit too big for backpacking, but I have to disagree now that I have it and have put it to use. Sure, ounces equal pain and it’s prudent to shave weight where you can, but for me the weight is WORTH the COMFORT it provides.This Sea to Summit Camp Plus SI is very comfortable, and offers a good balance on insulation from the ground. I use the Tasmanian Tiger Mark III Raid backpack and this pad fits perfect in the bottom section of the ruck. I absolutely love it. One of the best investments I’ve made.If ... MoreFor the longest time I’ve used leaf litter and other natural materials to improve my sleeping comfort on the trail. Old habits die hard thanks to Uncle Sam. However I decided it was time to invest in an actual pad.I almost didn’t buy it because I read it was a bit too big for backpacking, but I have to disagree now that I have it and have put it to use. Sure, ounces equal pain and it’s prudent to shave weight where you can, but for me the weight is WORTH the COMFORT it provides.This Sea to Summit Camp Plus SI is very comfortable, and offers a good balance on insulation from the ground. I use the Tasmanian Tiger Mark III Raid backpack and this pad fits perfect in the bottom section of the ruck. I absolutely love it. One of the best investments I’ve made.If you’re on the fence and can’t decide on this pad, pull the trigger. Unless you’re a weight wuss, I believe you will love it. You’ll get better sleep (back and side) which equates to better performance. Additionally, you’re getting all of these benefits in one of the best tactical colors on earth - OD Green. Thank you REI for providing another great product.
| Seasons | 3+ |
| Thickness | 7.5 cm |
| R-Value | 4.3 |
| Pack size | 20.4 x 34 cm |
| Dimensions | 183 x 64 cm |
