All warmth and traction, and no bulk. Our winter hiking boots feature 200g of insulation made from recycled plastic bottles, heat-trapping materials underfoot, and better grip on snow and ice. Non-marking multi-directional lugs. Stability shank. KEEN.WARM Recycled PET insulation rated to -25�F/-32�C. 4mm multi-directional lugs for traction. Performance mesh upper with TPU overlays for durability. KEEN.All-Terrain rubber outsole. KEEN.Dry waterproof, breathable membrane.