70% Coolmax, 28% nylon, 2% spandex * Lightweight, but dense terry padding is added to ball and heel for added protection. Also lightweight padding in the arch for better fit and support. * Size 9 fits ladies shoe sizes 5 -6.5, Size 10 fits ladies shoe sizes 7-9, Size 11 fits ladies shoe size 9.5 -11.5 * Coolmax construction for moisture transport, excellent blister protection while keeping you comfortably cool * 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