Nylon ripstop upper External rear sling locks in the heel 100% recycled breathable mesh lining 50% recycled EVA foam insole Rock plate for protection Medial post for light pronation relief Super Rebound Compound provides durable shock absorption to help reduce torque and allow for a smooth transition into the midfoot Vibram® Icetrek outsole designed to provide the improved grip on very cold, icy, or snowy surfaces New without box.