Yaktrax XTR Extreme - LargeProvides extreme outdoor traction on snow and ice. Patent pending spike design enhances traction while high strength chains resist rust and abrasion. Flexible, sturdy toe and heel plate prevents snow build up. Durable and lightweight. Adapts to most footwear. Comes with heavy duty nylon storage bag. Fits Women's size 13 15 and Men's size 11. 5 13. 5. Named after the sure footed Tibetan Yak, Yaktrax stretch over everything from casual walking shoes to