The Men's Revel IV High Polar Boot is a winter boot for exploring and making trails in fresh snow. A tall shaft height to keep snow out and KEEN.WARM recycled PET insulation to warm your feet on the coldest days. Rated to -40°F, with a KEEN.DRY waterproof, breathable membrane so your toes stay dry as well. Underfoot, a stability shank offers support while the KEEN.Polar traction outsole with 5mm lugs grips ice and snow to help you stay on your feet.