The ICEtrekkers Chains are Tire Chains for your feet. Perfect for any snowy conditions including packed and crusty surfaces. The durable links are individually TIG welded and made from hardened steel for durability. The unique ladder pattern under the ball of the foot, combined with the triangular pattern on the heel provides great traction, stable footing, and is comfortable for extended wear. The upper sling is flexible in subzero temperatures and stays securely on the foot, even in deep snow. Hardened steel links are individually welded for durability Durable rubber upper stays flexible even in subzero temperatures Unique ladder patterns under the ball of the foot and triangular pattern on heel for stable and comfortable traction Sizes: Small: Mens 5 6 Womens 5 8 Medium: Mens 6.5 0 Womens 7.5 11 Large: Mens 9.5 12.5 Womens 10.5 13.6 Extra Large: Mens 13up If you have especially bulky shoes it may be necessary to use the next size up.