REI Co-op COOLMAX EcoMade Lightweight Flash Crew Socks

Color: Blue Nights
please select a Size
Select size for delivery dates

Members get an estimated 10% back on this item as a part of your annual .

Members get an estimated 10% back on this item.
To buy,  sign in as an REI Co-op Member or join now.

Make a dash in the REI Co-op COOLMAX EcoMade Lightweight Flash Crew socks. Made from recycled water bottles, they offer minimal-but-long-wearing cushioning and a sport-style fit that stays put.


  • Breathable COOLMAX® EcoMade polyester wicks away moisture to keep feet drier
  • Targeted cushioning at heel and ball of foot for just-right comfort without too much bulk
  • Seamless toe construction helps prevent chafing
  • Supportive elastic at arch for extra support
  • Durable Achilles protection is strategically placed to help prevent blisters
  • Stretch nylon provides durability; spandex yarns improve fit
  • REI is Climate Neutral Certified; as we work to actively reduce our footprint, we measure annual carbon emissions and purchase an equivalent amount of verified carbon credits
  • 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



61% COOLMAX EcoMade polyester/32% nylon/5% polyester/2% spandex

Sock Height


Sock Cushioning

Ultralight Cushioning

Quick Drying


Moisture Wicking





Contains recycled materials

From a Climate Neutral Certified brand

Size Chart

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.

48 reviews with an average rating of 4.7 out of 5 stars

Loading Reviews...

Questions & Answers

Loading Questions...