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.

Color: Asphalt
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Members get an estimated 10% back on this item.
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Features

  • 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
  • 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 with imported and domestic yarns

Made in USA.

View the REI Co-op Flash Product LineView all REI Co-op Men's Hiking Socks

Technical Specs

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

Size Chart

REI Co-op Socks - Unisex Adult
SMLXLS/ML/XL
U.S. Men's5.5-8.59-1212.5-145.5-8.59-14
U.S. Women's4-6.57-9.510-12.54-9.510-12.5

Sizing Notes

For socks, please use shoe size.

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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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List of certifications which include The Climate Label certification,
        member informed certification and 100% satisfaction guarantee

Reviews
72 reviews with an average rating of 4.8 out of 5 stars

94% 29 of 31 reviewers recommended

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Average Overall Fit Rating

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Most Helpful Favorable Review

4 people found this review helpful
5 reviews with an average rating of 5.0 out of 5 stars
2 years ago
Very comfortable sock
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.

Most Helpful Critical Review

5 people found this review helpful
5 reviews with an average rating of 3.0 out of 5 stars
1 year ago
If "lightweight" means "cool" these are mislabeled
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
Flapjack
Location:Lancaster, MA.
Age:55–64
Typical Shoe Size:Mens 11
Rated 5.0 out of 5 stars
2 years ago

Very comfortable sock

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
Kiana S
Location:Tucson, Arizona
Age:18–24
Typical Shoe Size:Womens 7
Rated 5.0 out of 5 stars
1 year ago

Super comfy!!

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

Overall Fit Rating

Runs SmallRuns Large
buffalodan
Typical Shoe Size:Mens 11.5
Rated 3.0 out of 5 stars
4 months ago

Doesn't really feel like XL sizing

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
Cali
Location:california
Age:45–54
Typical Shoe Size:Mens 9
Rated 4.0 out of 5 stars
3 months ago

too heavy for summer

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

Overall Fit Rating

Runs SmallRuns Large
Tango
Location:North Central Washington state
Age:65–74
Typical Shoe Size:Womens 8
Rated 5.0 out of 5 stars
1 year ago

Perfect little sock

Lightweight, not thick, just enough wool content to keep feet warm, spandex to keep from slipping

Age:65–74
Typical Shoe Size:Womens 8
Quality Products Please
Location:San Francisco
Age:25–34
Typical Shoe Size:Womens 7
Rated 5.0 out of 5 stars
2 years ago

I love mine

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

Overall Fit Rating

Runs SmallRuns Large
shlyye
Location:San Mateo
Age:45–54
Typical Shoe Size:Womens 6.5
Rated 5.0 out of 5 stars
2 years ago

Great socks

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

Overall Fit Rating

Runs SmallRuns Large
Hot Foot
Location:New York, NY
Age:45–54
Typical Shoe Size:Mens 10.5
Rated 3.0 out of 5 stars
1 year ago

If "lightweight" means "cool" these are mislabeled

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
Shoeguy
Typical Shoe Size:Mens 12
Rated 5.0 out of 5 stars
2 years ago

Warm and cozy socks!

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

Overall Fit Rating

Runs SmallRuns Large
Ejenks
Location:Denver, CO
Age:35–44
Typical Shoe Size:Mens 13
Rated 5.0 out of 5 stars
1 year ago

Perfectly comfortable and dry

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

Overall Fit Rating

Runs SmallRuns Large
1 - 10 of 72 Reviews

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