Thorlos Unisex DLTX Dress Padded Crew Sock, Black, Medium 64% Thor Lon Acrylic/30% Nylon/6% Polyester Turn Inside Out-Machine Wash-Use Liquid Fabric Softner 64% THORLON Acrylic, 30% nylon, 6% 4-channel wicking polyester Designed to wear with dress shoes Size 11 fits shoe 5.5-8.5; size 13 fits 9-12.5; size 15 fits 13-15 Thorlon pads reduce blisters, calluses and foot fatigue 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