FoxRiver Bromley Lightweight Over-The-Calf Non-Wool Socks 57% polyester/40% Nylon/3% Spandex Made in US These lightweight otc socks are made from Thermo Lite with insulating fibers These non-wool socks provide gentle compression and moisture wicking for Warm, Dry, happy feet A cushioned Shin and heel protect you from bumps and bruises from top to bottom Urfit system provides arch support and memory-knit construction Proudly made in the USA, these cold weather socks are of high quality