Here's what other sites are saying:
The REI CoolMax(R) EcoMade Tab Back multisport socks outfit feet for active adventures, from cycling to hiking to running. CoolMax EcoMade fabric offers the same moisture-wicking, quick-drying performance as regular CoolMax, yet is made of recycled PET. Nylon adds durability and spandex offers stretch and shape retention; the snug fit will remain, wash after wash. Mesh-knit instep panels promote airflow and help move moisture away; heels and toes are reinforced to supply increased longevity. Lin Toe(R) ''no feel'' seams preclude irritation and chafing along toes. *Discount will be applied when you check out. Offer not valid for sale-price items ending in $._3 or $._9.
- REI refers to the women's version