Squad Goods Neoprene Toe Socks for Running, Cycling, Hiking - 1 Pair 3mm thick neoprene for good toe insulation. 95% Neoprene, 5% Nylon (for stretchability) Provides extra protection from wind and cold Perfect for running, cycling, hiking in cold weather Worn inside shoes and over socks Circumference of the toe socks: Small: 7 inches Medium: 8 inches Large: 9 inches