DeFeet Aireator Deline Socks 60% Coolmax EcoMade/ 39% Nylon/ 1% Lycra Made in US 60% Nylon, 39% Coolmax EcoMade, 1% Lycra Aieator mesh weave instep is light and speeds drying Low bulk and extrememly strong toe seam Machine wash cold, tumble-dry low, no chlorine bleach Made in the USA