The KEEN Revel IV High Polar is a waterproof winter boot for men and has a higher profile than earlier versions for deeper powder and Keen’s warmest insulation (rated to -40°C / -40°F) for comfort. The outsole has non-marking multi-directional 5mm lugs for increased traction. The KEEN.DRY waterproof, breathable membrane keeps your feet dry. It also features a Thermal Heat Shield insole to capture warmth.