Yaktrax Pro Traction Cleats instantly provide better traction, confidence andsafety for walking, jogging, or hiking on packed snow or ice. Pro TractionCleats fit over shoes and are secured with a durable rubber strap that ensuresan excellent fit. Traction is provided by a shaped-edge coil design thatprovides unequaled stability on ice and snow, letting users move aboutnaturally with the same solid grip as on dry surfaces. Yaktrax Pro TractionCleats are made of high-strength, abrasion and rust-resistant 1.4 mm steelcoils and heavy-duty natural rubber to help the cleats easily conform to theshape of any boot or shoe. Multiple coil angles provide 360 degrees oftraction on cold surfaces for stability in all directions. Because Yaktrax ProTraction cleats have been tested in temperatures as low as -41 degreesFahrenheit, they can be worn in a variety of environments, from icy Wisconsinstreets to packed-snow trails in wintery woods. Yaktrax Pro Traction Cleatsare available in small, medium, large, and extra-large sizes to fit mostshoes: Small (fits shoe size W6.5-10, M5-8.5); Medium (fits shoe sizeW10.5-12.5, M9-11); Large (fits shoe size W13-15, M11.5-13.5); X-Larger (fitsshoe size W15.5+, M 14+). For oversized shoes or boots, Yaktrax recommendspurchasing one size larger than your normal shoe size.