53% THOR¿LON Acrylic, 33% wool, 11% stretch nylon, 3% spandex * Midweight padding in the heel and ball protects the foot from shear and impact forces * Lace pad protects the top of the foot against boot lace pressure * Ventilation panel enhances moisture wicking * 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