ALPS Ice Grips Snow Traction Gear Slip on Snow and Ice Cleat Traction Prevent Slipping + 10 Extra Replacement Steel Studs (Red) EXTRA 10 PCS replacement steel studs included Designed to help you hike on packed snow or ice.Prevent slipping on snow and ice conditions. Strong natural rubber material with durable spiked traction Easy to get on and off with light weight constructions and folds up to fit in your pocket. Size Chart - Small - Women(5-7)/Men(3-5)/EU 31-36 Medium - Women(7-10)/Men(5-7)/EU 36-41 Large - Women(10-13)/Men(7-10)/EU 40-44 XLarge - Women(13-16)/Men(10-13)/EU 45-47