The best school shoe ever. Todo el material es sintético y de calidad cuestionable They are tough. Theres room for a heel cushion to pad my Achilles tendon. ) Their site does not work and you cannot get drivers. Its making hip thrusts and hip bridges with my barbell SO much more comfortable when theres a lot of weight on the bar. Theyre great. My next pair will be without memory foam thats for sure. For the price I got these for Im very happy. Amazon say contact Western Digital because its past 30 days.