With all the great features the PhD Run Ultra Light Micro sock has to offer, it wouldn't be surprising if the latest technology was hiding in your sock drawer. The Indestructawool technology gives you a longer life, while the 4 Degree system provides a performance-supporting fit. Plus, Shred Shield technology reduces toe abrasion. It's breathable, comfortable and designed to take you one step further.
With all the great features the PhD Run Ultra Light Micro sock has to offer, it wouldn't be surprising if the latest technology was hiding in your sock drawer. The Indestructawool technology gives you a longer life, while the 4 Degree system provides a performance-supporting fit. Plus, Shred Shield technology reduces toe abrasion. It's breathable, comfortable and designed to take you one step further.
in 3 offers
The lowest price for Smartwool Phd Run Ultra Light Micro Socks - Black Medium right now is $29.95 at Summit Gear, compared across 2 retailers.
The all-time low was $29.95 on 9 Oct 2025. That's the lowest price we've ever tracked — a great time to buy.
Prices last updated 10 May 2026.
Smartwool Phd Run Ultra Light Micro Socks - Black Medium
With all the great features the PhD Run Ultra Light Micro sock has to offer, it wouldn't be surprising if the latest technology was hiding in your sock drawer. The Indestructawool technology gives you a longer life, while the 4 Degree system provides a performance-supporting fit. Plus, Shred Shield technology reduces toe abrasion. It's breathable, comfortable and designed to take you one step further.
With all the great features the PhD Run Ultra Light Micro sock has to offer, it wouldn't be surprising if the latest technology was hiding in your sock drawer. The Indestructawool technology gives you a longer life, while the 4 Degree system provides a performance-supporting fit. Plus, Shred Shield technology reduces toe abrasion. It's breathable, comfortable and designed to take you one step further.
Last updated at 10/05/2026 01:31:02
Smartwool Run Zero Cushion Low Ankle Black l Size M l Summit Gear
Delivery between 13–21 May $15
Smartwool Run Zero Cushion Low Ankle Black l Size M l Summit Gear
Delivery between 13–21 May $15
Smartwool PhD Run Ultra Light Micro Socks - Black Medium
Delivery $9.99
originally posted on smartwool.com
#smartwoolLove I wore these socks on a 10 km hike today. It was 5 degrees C(42 degrees F) outside. My feet were the perfect temperature. Not too hot or cold. The socks did not move inside my boots. My feet were as comfy as could be. I prefer to wear midcalf height socks hiking but many of the customers that come into our Smartwool store in Whistler Canada want ankle height socks. This is the perfect hiking sock for them.
originally posted on altitude-sports.com
I bought several pairs as gifts - but kept these to try out for a snow shoe, shovelings and outdoor walks. Absolutely recommend Smartwool as a brand, but this pair surpassed my expectations. Incredible fit - at the heel, no slipping around in my boots; toes remained warm after an hour of snowshoeing; and they did not fall/slide down from my calf. Chose MEDIUM as I wear an 8 sized boot or shoe. Best value !
originally posted on REI
These blister worse than any other sock I have ever run in, ever. I am floored that they have any positive reviews whatsoever.I have been running regularly (30+ miles/week on average) for over seven years, including road and trail and some ultra-distance running, and frequently run in Brooks, Puma, Adidas, and Darn Tough socks with no issues (including thick and thin, wool, nylon, polyester, the works). These give me blisters in less than 4 miles. I have used them on road and trail in Brooks, Saucony, Nike, and La Sportiva shoes and always gotten blisters. Yes, I ordered the correct size. Too bad I missed the return window. I can't believe these are being sold for seventeen dollars.
| Sport | Running |
| Product class | Clothing |
Smartwool Run Zero Cushion Low Ankle Black l Size M l Summit Gear
Delivery between 13–21 May $15
Smartwool Run Zero Cushion Low Ankle Black l Size M l Summit Gear
Delivery between 13–21 May $15
Smartwool PhD Run Ultra Light Micro Socks - Black Medium
Delivery $9.99
#smartwoolLove I wore these socks on a 10 km hike today. It was 5 degrees C(42 degrees F) outside. My feet were the perfect temperature. Not too hot or cold. The socks did not move inside my boots. My feet were as comfy as could be. I prefer to wear midcalf height socks hiking but many of the customers that come into our Smartwool store in Whistler Canada want ankle height socks. This is the perfect hiking sock for them.
I bought several pairs as gifts - but kept these to try out for a snow shoe, shovelings and outdoor walks. Absolutely recommend Smartwool as a brand, but this pair surpassed my expectations. Incredible fit - at the heel, no slipping around in my boots; toes remained warm after an hour of snowshoeing; and they did not fall/slide down from my calf. Chose MEDIUM as I wear an 8 sized boot or shoe. Best value !
These blister worse than any other sock I have ever run in, ever. I am floored that they have any positive reviews whatsoever.I have been running regularly (30+ miles/week on average) for over seven years, including road and trail and some ultra-distance running, and frequently run in Brooks, Puma, Adidas, and Darn Tough socks with no issues (including thick and thin, wool, nylon, polyester, the works). These give me blisters in less than 4 miles. I have used them on road and trail in Brooks, Saucony, Nike, and La Sportiva shoes and always gotten blisters. Yes, I ordered the correct size. Too bad I missed the return window. I can't believe these are being sold for seventeen dollars.
The Smartwool Women's Performance Hike Light Cushion Margarita Ankle Socks are a great companion to your light hiking adventures. I typically prefer my hiking socks to be at the crew length, but this is a great option for those warmer days or when you leave your hiking boots behind. This soak pairs well with trail running and/or hiking shoes this sock has cushion for long days on the trail or lounging around on a winter day. Would recommend!
Love the padding / cushioning in the right places, such as the heel (where I’ve gotten a blister). Size medium pair is perfect for a size 7.5-8 foot size. The sock is thicker then I thought. Perfect for a cool fall and winter hikes. I’d go for a thinner pair for warm days. The fabric is wool therefore it will keep you cool anyhow. It is a matter of preference. Socks are comfortable and feels like my feet are being hugged. I look forward to buying more products from Smartwool!
I love this brand of socks and these ones fit perfectly. I wear size 6.5 (sometimes 7) and I order the small woman's fit. I also have narrow feet, if you have wide feet you could probably order a size up. They have cushioning in the appropriate places for running and are thinner on top. In general, Smartwool socks wear very well and last. I haven't worn through the ones I bought 6 years ago, although there is a bit of pilling.
Smartwool socks shrink in the wash. I would normally get a size large but after a couple washes Smartwool socks are painfully tight on my toes. I try stretching them out to make them longer but it doesn't work. So now I buy extra large because these shrink down to the correct size. Problem solved. Except with these zero cushion socks. Even the extra large are small and are shrinking up to be too small. The cushioned low ankle socks are great, just get one size larger. These need maybe two sizes larger. Unfortunately, xl is the largest.
I generally love Smartwool socks. I have tons of them. These socks, however, are not lightweight. They are quite thick and make it nearly impossible for me to get my feet into my favorite hiking boots and waterproof trail runners. So basically they're rather useless, since they're low-ankle socks. They're too low to be worn in the winter but too thick to be useful in the summer.
I’m ruined. All my other socks are now sub-par. From the moment I slipped these on my feet, my life was changed. Soft like butter.. no.. clouds; wrapping, cushioning (in all the right places)- on my feet. They don’t slide, they don’t bunch, they don’t give me blisters, and even after warm Florida days hiking in the sun, they don’t smell! I’m on my feet a lot as a nurse, and while running or in moments of rest, at rest, they give comforting hugs.In all seriousness, I have never loved a pair of socks more than these! I have now received more as gifts for Christmas and bought some as gifts as well once I realized how much a pair of socks can literally cause happiness and joy. They’re good for big feet, small feet, sweaty feet, painful or plantar fasciitis feet, and ... MoreI’m ruined. All my other socks are now sub-par. From the moment I slipped these on my feet, my life was changed. Soft like butter.. no.. clouds; wrapping, cushioning (in all the right places)- on my feet. They don’t slide, they don’t bunch, they don’t give me blisters, and even after warm Florida days hiking in the sun, they don’t smell! I’m on my feet a lot as a nurse, and while running or in moments of rest, at rest, they give comforting hugs.In all seriousness, I have never loved a pair of socks more than these! I have now received more as gifts for Christmas and bought some as gifts as well once I realized how much a pair of socks can literally cause happiness and joy. They’re good for big feet, small feet, sweaty feet, painful or plantar fasciitis feet, and can even make a vegan break their vows and succumb to the magic that is Smartwool. Throw all your other socks away; trust me, you need these.
I loved these so much a bought a second pair. They have great cushion for running (as you'd expect since that is their purpose in life) and keep my feet the perfect temp. Warm enough for the coldest runs (I usually don't run if the wind chill is below zero, but i've been know to run in single temps on a calm day) and also wool, so they don't get soggy if my feet sweat. I haven't had a problem with my feet feeling too warm. I also like the crew length because it covers the gap that inevitably appears between the hem of my leggings and the top of a short sock. Exposed to the cold temps, that area gets cold- but not with these socks.
| Sport | Running |
| Product class | Clothing |
