24% Lycra Spandex, 76% Micro-Nylon Imported Targeted Plantar Fasciitis Relief: OrthoSleeve FS4 Plantar Fasciitis Relief Socks provide targeted pain relief for swollen feet, arch and heel pain, along with achilles tendonitis relief. Comfort & Support:The light-weight design provides continuous support of the plantar fascia by gently stretching the fascia tissue while supporting tendons & joints needed to stay healthy. The Y-Gore heel provides extra cushioning, while 360 degree blister protection provides for a long-lasting comfortable fit Patented Compression Zone Technology: Our 4-zone medical grade compression technology provides light to firm compression in the right places to support the achilles, lift the plantar fascia, boost venous flow and stabilization, and provide a shaped-to-fit design Moisture-Wicking & Breathable: Our plantar fasciitis compression socks are made of quality, moisture-wicking fabric that allows the sock to breathe during movement. Find Your Perfect Fit: The Plantar Fasciitis Socks are anatomically designed for the right and left foot to provide the perfect fit. Use the size chart before ordering for the best fit.