Wrightsock Men's Escape Quarter Single Pair Socks, Navy, Sock Size:10-13/Shoe Size: 6-12 Outer: 68% Polyester/24% Nylon/8% Lycra; Inner: 70% Polyester/26% Nylon/4% Lycra 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