Wrightsock Men's Escape Crew Single Pair Socks Outer: 68% Polyester, 24% Nylon, 8% Lycra; Inner: 70% Polyester, 26% Nylon, 4% Lycra Made in USA Pull On closure Machine Wash Double layer reduces the causes leading to blisters - friction, moisture and heat with an integrated system of two socks knit together Blister free guarantee Versatile performance with great fit and feel Walk or hike in all season comfort Two layers trap air for effective insulation from heat and cold