Duenorth All Purpose Lg Enhanced rubber compound provides added traction and secure fit while retaining elasticity in subzero temperatures. Geometrically designed top webbing and improved shape provides a more comfortable and secure fit on a greater variety of footwear. Knurled, textured lining and wide, thick heel strap grips footwear better and helps keep traction aids in place for longer wear and optimal performance. 6 Tungsten Carbide Due North Ice Diamond Spikes, along with the bi-directional tread, provides powerful traction with maximum grip Size(Shoe Size): Small: Women's 5-8, Men's 4-7; Medium: Women's 8.5-11, Men's 7.5-10; Large: Women's 11.5-13; Oversized: For overized/bulky footwear 10+ or Standard Footwear Men's 13.5-16