Last updated at 20/05/2026 19:05:07
originally posted on altitude-sports.com
I purchased for a use not true to this products description. I wanted a pad sheet for my Sea to summit ultra light comfort plus pad... in the summer I was sticking to my pad, So I thought to use this sheet as a pad liner. While it fits inside OK... the hood of the sheet isn't ideal since there is a plastic synch. There is way too much fabric at the hood for my alternative use... but it was cool to sleep on and I assume it would be great for its original intended use.
originally posted on altitude-sports.com
This liner is great for sleeping out in warm weather. Fairly light and packs down small. Nice feel to the fabric If temperature drops overnight I pull up my sleeping bag. It’s basically a liner so don’t expect it to add much warm in colder weather.
originally posted on altitude-sports.com
Soft, breathable and packs up compact. This is a great liner and perfect way to keep your bag clean or sleep in hotter weather without it. Feels a little like sleeping in a thin sock. Definitely recommend.
| Shape | Mummy |
| Max. User Height | 210 cm |
| Internal Girth | 180 cm |
| External Dimensions | 210L x 90W cm |
| Packed Dimensions | 17L x 11W x 11H cm |
I purchased for a use not true to this products description. I wanted a pad sheet for my Sea to summit ultra light comfort plus pad... in the summer I was sticking to my pad, So I thought to use this sheet as a pad liner. While it fits inside OK... the hood of the sheet isn't ideal since there is a plastic synch. There is way too much fabric at the hood for my alternative use... but it was cool to sleep on and I assume it would be great for its original intended use.
This liner is great for sleeping out in warm weather. Fairly light and packs down small. Nice feel to the fabric If temperature drops overnight I pull up my sleeping bag. It’s basically a liner so don’t expect it to add much warm in colder weather.
Soft, breathable and packs up compact. This is a great liner and perfect way to keep your bag clean or sleep in hotter weather without it. Feels a little like sleeping in a thin sock. Definitely recommend.
Idk how this material is made, but it’s changed my life! As a hot sleeper and as someone who’s done sleep studies for not sleeping, I feel like a real human now. I was too excited to wait for my next backpacking trip to test it out, so I gave it a shot one night and slept through the WHOLE night. And been doing it ever since. Maybe I needed to be swaddled like a child… home or in the forest, I can finally sleep.Now I’m wondering how do I get this material in a full bed set?!
I sleep hot and was looking for something that could double as an extra layer under a quilt on colder nights and be used by itself on warm and humid nights. This product is perfect! It’s very lightweight for backpacking yet substantial enough to get the job done. It’s breathable so no sweating yet provides the covering to prevent drafts/chills. It’s soft to the touch and stretchy and roomy - perfect for someone like me who sleeps in all positions and tosses and turns at night. The pillow pocket is a great perk for keeping your pillow in place…and creates an area to tuck your hands and arms inside, keeping them lightly covered when stomach sleeping. Love this purchase and so glad I made the decision to get it!
This liner seems well-made and comfortable with a good size and super-stretchy material. It seems like it could work well both as an all-season liner or during hot summer nights on its own and I look forward to testing it out in different conditions. Another quality Sea to Summit product.
Bought this for warm weather camping to use on its own. The material is really soft and feels a lot nicer than the slippery sleeping bag material, especially in warm humid weather. I also plan to use it as an additional liner in my sleeping bag for colder shoulder season camping. That being said, if you like a heavier blanket to sleep/cuddle with, I wouldn't recommend this one as it's intentionally super light. Also FYI you can see through it pretty easily
This thing takes a tiny amount of space. You don't even need the stuff sack, just throw it in the sleeping bag stuff sack so you never lose it. It's used as a lining between your down bag and yourself. It adds a thin layer to keep drafts out. Most important, it keeps your down bag clean. At the end of a trip, just throw the liner in the wash. Down does not like to be cleaned. This is just brilliant.
I love this liner! I had originally purchased this for camping. But it also works great for hot flashes/ night sweats. It makes sleeping SOOO much more comfortable. It’s nice and stretchy and roomy. Honestly I have actually walked in it. It also falls to the ground easily if you need to get out of it. It’s sheer and flowy and wicking. It is very well made and stands up to frequent washing. The only complaint is that once it is out if the bag, it doesn’t fit back in easily. The back could be larger so it stows easily.
The Coolmax Liner is very breathable. Wicks body moisture well. It doesn't add a level of warmth, which in our case is a good thing. Our sleeping bags don't need any help in that department. It's a great idea to have any liner really. A lot easier to clean a liner than a sleeping bag. When I saw it had no zipper, I thought it would be difficult to get into. Not the case. The fabric is light and stretchy. Very easy to get into. Turns out, no zipper is a blessing. We all know how easy zippers can be at 3 in the morning when we're in a particular hurry to exit our sleeping bag! ;) ;)
| Shape | Mummy |
| Max. User Height | 210 cm |
| Internal Girth | 180 cm |
| External Dimensions | 210L x 90W cm |
| Packed Dimensions | 17L x 11W x 11H cm |
Adaptor Coolmax Liner - Sea to Summit
The Adaptor COOLMAX sleeping bag liner will help you adapt to varying temperatures and humidity. The washable, knitted COOLMAX fabric wicks moisture away from your skin, which helps keep you comfortable as temperatures rise and humidity increases, guaranteeing a great night’s sleep. The COOLMAX Adaptor liner is ideal for use on its own in warm, humid climates, or as a liner inside your sleeping bag as you transition across seasons, and it's great for keeping your sleeping bag clean and hygienic. It's also available in an Insect Shield version for extra protection in buggy environments. Features COOLMAX fabric is made of a soft, stretchy polyester-knit fabric Wicks moisture from your skin, keeping you dry and comfortable in humid conditions Mummy shape features a drawcord to cinch hood around your head. The drawcord channel is contrasting color to make it easier to find in low light conditions. Traveller shape features a built in pillow slip and side openings for easier entry and exit. Easy care – no special soap is needed for washing. Packs into its own Ultra-Sil stuff sack.
The Adaptor COOLMAX sleeping bag liner will help you adapt to varying temperatures and humidity. The washable, knitted COOLMAX fabric wicks moisture away from your skin, which helps keep you comfortable as temperatures rise and humidity increases, guaranteeing a great night’s sleep. The COOLMAX Adaptor liner is ideal for use on its own in warm, humid climates, or as a liner inside your sleeping bag as you transition across seasons, and it's great for keeping your sleeping bag clean and hygienic. It's also available in an Insect Shield version for extra protection in buggy environments. Features COOLMAX fabric is made of a soft, stretchy polyester-knit fabric Wicks moisture from your skin, keeping you dry and comfortable in humid conditions Mummy shape features a drawcord to cinch hood around your head. The drawcord channel is contrasting color to make it easier to find in low light conditions. Traveller shape features a built in pillow slip and side openings for easier entry and exit. Easy care – no special soap is needed for washing. Packs into its own Ultra-Sil stuff sack.
The Adaptor COOLMAX sleeping bag liner will help you adapt to varying temperatures and humidity. The washable, knitted COOLMAX fabric wicks moisture away from your skin, which helps keep you comfortable as temperatures rise and humidity increases, guaranteeing a great night’s sleep. The COOLMAX Adaptor liner is ideal for use on its own in warm, humid climates, or as a liner inside your sleeping bag as you transition across seasons, and it's great for keeping your sleeping bag clean and hygienic. It's also available in an Insect Shield version for extra protection in buggy environments. Features COOLMAX fabric is made of a soft, stretchy polyester-knit fabric Wicks moisture from your skin, keeping you dry and comfortable in humid conditions Mummy shape features a drawcord to cinch hood around your head. The drawcord channel is contrasting color to make it easier to find in low light conditions. Traveller shape features a built in pillow slip and side openings for easier entry and exit. Easy care – no special soap is needed for washing. Packs into its own Ultra-Sil stuff sack.
The Adaptor COOLMAX sleeping bag liner will help you adapt to varying temperatures and humidity. The washable, knitted COOLMAX fabric wicks moisture away from your skin, which helps keep you comfortable as temperatures rise and humidity increases, guaranteeing a great night’s sleep. The COOLMAX Adaptor liner is ideal for use on its own in warm, humid climates, or as a liner inside your sleeping bag as you transition across seasons, and it's great for keeping your sleeping bag clean and hygienic. It's also available in an Insect Shield version for extra protection in buggy environments. Features COOLMAX fabric is made of a soft, stretchy polyester-knit fabric Wicks moisture from your skin, keeping you dry and comfortable in humid conditions Mummy shape features a drawcord to cinch hood around your head. The drawcord channel is contrasting color to make it easier to find in low light conditions. Traveller shape features a built in pillow slip and side openings for easier entry and exit. Easy care – no special soap is needed for washing. Packs into its own Ultra-Sil stuff sack.
in 3 offers
The lowest price for Adaptor Coolmax Liner - Sea to Summit right now is $89.99 at Boss Outdoor, compared across 3 retailers.
The all-time low was $29.00 on 29 Sept 2025 — today's price is 210% above the lowest ever. It has been notably cheaper before — worth setting a price alert.
Prices last updated 20 May 2026.
