FEATURES: Medium/ fit for US size 6.5-9.5 Large/ fit for US Size 10-11.5 70% cotton, 22% nylon, 8% spandex The socks for towel sports fabrics-Compression sports socks front heel is cushioned to prevent injury from friction with the shoes when playing or exercising. -Breathable mesh -Reinforced Heel and Toe: Long Lasting Durability. - Extra support for the ankle and arch - Stays in place and does not slide down - Improved blood circulation, recovery, and performance. - Reduce plantar fasciitis, achiles tendon,metatarsal,heel pain symptoms and swelling