The OS1st Plantar Fasciitis Crew Socks strengthen your foot structure so you can experience fewer foot injuries for all your favorite active activities. These socks are made of LYCRA Spandex and Nylon Fabric with patented Compression Zone Technology that offers a comfortable and durable fit and feel. It features extra cushioning without the added bulk, plus medical-grade support that can prevent conditions like Plantar Fasciitis, Foot Fatigue, and Arch/Heel Pain. The OS1st Plantar Fasciitis Crew Socks offer the comfort and support you want so you can enjoy all your sports without worry!