Features typically include: 100 grams Primaloft® Gold Eco Series synthetic insulation Waterproof membrane seals out water and lets moisture escape Vibram® Icetrek outsole designed to provide the improved grip on very cold, icy, or snowy surfaces Medial zipper and heel pull tab for easy on and off Bellows tongue keeps out debris External rear sling locks in the heel FloatPro™ Forefoot and heel cushioning pods Super Rebound Compound midsole with 15% recycled flecks provides durable shock absorption to help reduce torque and allow for a smooth transition into the midfoot Cleansport NXT™ treated for natural odor control