Thorlos Mens - Womens Tennis Moderate Padded Crew Socks | T2CXU 85% Thor-LON Acrylic, 12% Nylon, 3% Spandex. Turn Inside Out-Machine Wash-Use Liquid Fabric Softner 60% Coolmax, 21% THORLON Acrylic, 14% nylon, 5% spandex Midweight padding for protection against shock, impact and shear forces Size 11 fits shoe 5.5-8.5; size 13 fits 9-12.5; size 15 fits 13-15 Constructed of a blend of Coolmax and Thorlon Acrylic to provide superior wicking characteristics, durability, and resilience in a midweight construction Wash and dry inside out (to fluff up the pads) using liquid fabric softener after each use (to lubricate the fibers for longer life). Liquid fabric softeners critical to receive full benefit of the product design