Easy to pull on, this sturdier version of the Yaktrax Walker boasts a steel-coil system that digs into ice, preventing wipeouts on glazed driveways. Just hook over shoe toe and stretch over heel to secure in place. Works on both shoes and boots. Remove Yaktrax before walking on smooth indoor surfaces. S: Men's 5-8.5; Women's 6.5-10. M: Men's 9-11; Women's 10.5-12.5. L: Men's 11.5 - 13.5, Women's 13 - 15. XL: Men's 14+, Women's 15.5+.