56% Coolmax, 26% THOR¿LON Acrylic, 14% nylon, 4% spandex Lightweight padding in heel and ball protects the foot from shear and impact forces Size 11 fits shoe 5.5-8.5; size 13 fits 9-12.5; size 15 fits 13-15 Flat knit and spandex at instep for less bulk, ultimate fit 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