Shock Doctor X-Active is an all-purpose cross-sport orthotic designed to provide cushion, shock absorption and support. Shoe Size Chart: XS, M 3-4, W 4-5 – SM, M 5-6 / W 6-7 – MD, M 7-8 / W 8-9 – LG, M 9-10 / W 10-11 – XL, M 11-12 / W 12-13 – XXL, M 13-15 All-purpose cross-sport orthotic designed to provide cushion, shock absorption and support Deep heel pocket integrates a stable support base into your shoe Multi-density foam layers increase heel and forefoot shock absorption Metatarsal arch supports mid-foot and relieves Plantar Fasciitis pain Butterfly chassis provides flexible medial arch support Airfx cover provides anti-microbial and moisture managementShoe Width: Standard.