How to Choose Hiking Socks
REI Co-op Flash Merino Wool Lightweight Quarter Socks
$17.95
The REI Co-op Flash Merino Wool Lightweight quarter socks are our most popular summer-weight hiking socks for good reason—they're naturally breathable, sweat wicking, quick drying and odor resistant.
- Targeted cushioning at heel and ball of foot without too much bulk
- Reinforcement at heels, toes, footbeds and Achilles provides long-wearing comfort
- Supportive elastic at arch for extra support
- Seamless toes prevent chafing
- Machine wash in cold or warm water; do not use bleach or fabric softener; tumble dry low
- Made in USA with imported and domestic yarns
- REI Co-op brand is certified to The Climate Label; we actively fund efforts to reduce carbon emissions across our business and support climate projects around the world
Made in USA.
View the REI Co-op Flash Product LineView all REI Co-op Men's Hiking Socks| Best Use | Hiking |
|---|---|
| Fabric | 45% merino wool/44% nylon/8% polyester/3% spandex |
| Sock Height | Ankle |
| Sock Cushioning | Light Cushioning |
| Quick Drying | Yes |
| Moisture Wicking | Yes |
| Gender | Unisex |
| Sustainability | From a Climate Label Certified brand |
REI Co-op Socks - Unisex Adult
| S | M | L | XL | S/M | L/XL | |
|---|---|---|---|---|---|---|
| U.S. Men's | 5.5-8.5 | 9-12 | 12.5-14 | 5.5-8.5 | 9-14 | |
| U.S. Women's | 4-6.5 | 7-9.5 | 10-12.5 | 4-9.5 | 10-12.5 |
Sizing Notes
For socks, please use shoe size.
Buying Advice
Better gear is built together
From feedback to field testing, all of our gear is dialed-in by REI Co-op members. Their adventures informed every stitch and detail—making for better, longer-lasting gear.
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Most Helpful Favorable Review
Very comfortable sock
Flapjack2 years ago
I just purchased these over the weekend, and they arrived yesterday. They fit really well and are really comfortable. I love the cushioning in the right places and even though it is 85 today my feet are very comfortable.
Will buy more for sure.
Flapjack
Lancaster, MA.
4 people found this review helpful
Most Helpful Critical Review
If "lightweight" means "cool" these are mislabeled
Hot Foot1 year ago
The term "lightweight" might be in the sole of the beholder. I'm sure they're file, but they're hot. And by this is that my feet are HOT in these socks. Similar socks from Icebreaker? Not HOT.
I suspect this is mostly related to them being 45% Merino Wool and 55% synthetic fabrics. They should be called Merino Wool Blend socks.
Hot Foot
New York, NY
5 people found this review helpful
Flapjack
Lancaster, MA.
Very comfortable sock
2 years ago
I just purchased these over the weekend, and they arrived yesterday. They fit really well and are really comfortable. I love the cushioning in the right places and even though it is 85 today my feet are very comfortable. Will buy more for sure.
Age:55–64
Typical Shoe Size:Mens 11
Yes , I recommend this product
Kiana S
Tucson, Arizona
Super comfy!!
1 year ago
I’m in Arizona and it’s really hot out here! These are my first pair of merino wool socks and I love it! Will definitely go get more!
Age:18–24
Typical Shoe Size:Womens 7
Yes , I recommend this product
buffalodan
Doesn't really feel like XL sizing
1 month ago
The socks have the targeted cushion that I was looking for, however, my confusion is with the sizing. I vary between a 11.5-12" shoe size but like a larger sock as I do not like a sock that is too tight. That is why I get an XL. Really wondering what someone with a size 13 or larger does as these are really snug around my foot and ankle before washing.
Typical Shoe Size:Mens 11.5
Yes , I recommend this product
Cali
california
too heavy for summer
1 month ago
husband says they are too thick for summer- his feet got hot. great cushion. medium is true to size for men size 9
Age:45–54
Typical Shoe Size:Mens 9
Yes , I recommend this product
Tango
North Central Washington state
Perfect little sock
1 year ago
Lightweight, not thick, just enough wool content to keep feet warm, spandex to keep from slipping
Age:65–74
Typical Shoe Size:Womens 8
Yes , I recommend this product
Quality Products Please
San Francisco
I love mine
2 years ago
I saw them on sale in a wooden barrel at my local REI, took a chance, and they became my favorite pair of warm socks this winter. I couldn’t find them in store again after that, and I also couldn’t find them online again until today. I like them more than SmartWool for warmth, but they are not as smooth as SmartWool. I’d pick the REI socks again over SmartWool because what’s the point of a wool sock that isn’t helping you feel warm? I’m sorry, I don’t remember what size I bought, but for socks I don’t mind S/M
Age:25–34
Typical Shoe Size:Womens 7
Yes , I recommend this product
shlyye
San Mateo
Great socks
2 years ago
So sad. Washed and worn only twice and toe seam of one sock is already coming undone, and my toe almost protrudes. Terrific socks otherwise. Great cushion and fits perfectly.
Age:45–54
Typical Shoe Size:Womens 6.5
Yes , I recommend this product
Hot Foot
New York, NY
If "lightweight" means "cool" these are mislabeled
1 year ago
The term "lightweight" might be in the sole of the beholder. I'm sure they're file, but they're hot. And by this is that my feet are HOT in these socks. Similar socks from Icebreaker? Not HOT. I suspect this is mostly related to them being 45% Merino Wool and 55% synthetic fabrics. They should be called Merino Wool Blend socks.
Age:45–54
Typical Shoe Size:Mens 10.5
No, I do not recommend this product
Shoeguy
Warm and cozy socks!
2 years ago
I tried so many cheap socks from Walmart and other places but was disappointed because my feet would sweat and I’d have a lingering bad odor in my shoes and on my feet and I couldn’t use the same pare of socks for a few days. I found these and I love them! I can wear them for like 2-3days and they don’t smell from my sweaty feet and I love how they feel and support the feet. Best socks ever!
Typical Shoe Size:Mens 12
Yes , I recommend this product
Ejenks
Denver, CO
Perfectly comfortable and dry
11 months ago
These are soft and stretchy. I have troubles finding socks to fit my feet (size 13), as even larger socks sometimes are uncomfortable, like the aren't wide enough from the heel to the ankle and don't stretch. I'm very picky about my socks, and I want to fill my whole dresser with these.
Age:35–44
Typical Shoe Size:Mens 13
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