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 Faciitis Crew Socks offer the comfort and support you want so you can enjoy all your sports without worry!