Men's Revel IV Polar Boot More warmth and traction without the bulk. The agility of a light hiker with the warmth of a down jacket. We built these men's winter boots with active, frigid days in mind. With 200g of insulation, heat-trapping materials underfoot, and exceptional grip on snow and ice. Features Non-marking multi-directional lugs for increased traction 5mm multi-directional lugs for traction Stability shank delivers lightweight support KEEN.WARM Recycled PET insulation rated to -25F/-32C KEEN.DRY waterproof, breathable membrane Eco Anti-Odor for natural odor control Environmentally preferred premium leather from LWG-certified tannery Material Waterproof leather and performance mesh upper KEEN.Polar Traction outsole for more grip on snow and ice Compression-molded EVA midsole for cushioning Breathable textile lining Thermal Heat Shield insole captures warmth Technologies KEEN.Dry A proprietary waterproof, breathable membrane that lets vapor out without letting water in. KEEN.Warm Who knew charcoal bamboo could create something that keeps your feet warm? But it makes KEEN.Warm