For those that train in the most intense of conditions we present the durable Thorlos Outdoor Athlete sock! Sold in a one-pair pack. Quarter-length sock with reinforced top to help keep dirt and debris out. Moisture-wicking construction offers moisture absorption and retention with THORWICK Cool fibers. Ventilation panels in toe and instep with ankle/foot transition gusset to fight wrinkling. Form fit with compression-grade ankle and arch support protects plantar fascia fights fatigue and prevents bunching and twisting. Light density padding in ball and heel protects weight-bearing areas. 69% THORWICK COOL 25% nylon 5% elastic 1% polyester. Made in the U.S.A. Made in the USA.