Shearling linings External rear slings lock in your heels Protective and abrasion-resistant synthetic heel and toe caps 100 g PrimaLoft® Gold Eco Series synthetic insulation 100% recycled mesh footbed covers Cleansport NXT™ treated for natural odor control 50% recycled removable EVA foam footbeds FloatPro™ forefoot and heel cushioning pods Super Rebound Compound midsoles provide durable shock absorption to help reduce torque and allow for a smooth transition onto the midfoot Vibram® Icetrek outsoles are designed to provide improved grip on very cold, icy or snowy surfaces