Sox Performance Sport Plantar Fasciitis Crew Arch Compression Socks, Pairs - SS3011 70% Silver DrystatPolypropylene, 10% Lycra, 10% Nylon, 10% Spandex Imported Size Chart: Small (Womens 5-8, Mens 4-7), Medium (Womens 8-10, Mens 7-9), Large (Womens 10-12, Mens 9-11), X-Large (Mens 11-14). Due to the stretchability of the sock, if your shoe size is between sizes, choose the smaller. Silver DryStat, giving you a quick drying odor resistant sock Boost your performance for any sport activity, Yoga, Gym, Running, Walking, Standing, Travel, or just sitting on the couch Compression is proven to improve blood flow, move faster, react quicker and use less energy Designed, tested and manufactured in our Italian factory, to elite athletes compression standards Mid foot Plantar Fasciitis Support Zone also prevents pooling of blood