Medium fits Men's 8-9.5 and Women's 9-10.5 shoe sizes * Active compression wear assisting in the prevention and treatment of Plantar Fasciitis Heel Pain Heel Spurs and Arch Pain * Designed with targeted compression zones and silver microbial fibers the Thermoskin© FXT Compression Socks provide firm support and help relieve the heel pain associated with Plantar Fasciitis * How Thermoskin FXT Compression Socks Help: - Medical grade compression to unload stress on the Plantar Fascia. - Arch support and elevation. - Compression on the Achilles tendon. - Moisture wicking anti-odor and anti-bacterial properties. -All in one design for everyday and active wear. Read more