DeFeet Speede Socks 50% Coolmax EcoMade/ 49% Nylon/ 1% Lycra Made in US 60% Nylon, 39% Coolmax EcoMade, 1% Lycra Aieator mesh weave instep is light and speeds drying Lightweight, durabale and soft on the inside for extra comfort Machine wash cold, tumble-dry low, no chlorine bleach Made in the USA