The Yaktrax XTR provides extreme traction on snow and ice A patent pending spike design enhances traction and ice while preventing snow build up It is designed for anyone who prefers to go off road during the winter months. Hike and Run with confidence on all outdoor trails. The XTR is made with high resist rust and abrasion. To ensure natural rubber outerband that will be worn in temperatures as low as -41 degrees Fahrenheit. Size XLarge fits Men Shoe Size 14 and above and Women"s Shoe Size 15.5 and above.