The KEEN Revel IV Mid Polar Waterproof Boots are a lightweight hiker with the warmth of a down jacket. Built with active, frigid days in mind, they are made with a waterproof, breathable membrane and durable leather upper alongside a high performance cold-weather insulation and Thermal Heat Shield insole for optimum warmth. A compression-moulded EVA midsole and stability shank also deliver cushioning and lightweight support, while Eco Anti-Odour ensures natural odour control for when you up the pace. To finish, you can rely on the Polar Traction outsole and multi-directional lugs for more grip on snow, ice and un-predictable surfaces.  Care Advice Gently brush the footwear with a soft bristle brush or hand towel to remove loose dirt and debris. Stains can be treated by lightly rubbing a gum eraser in a circular motion over the location and lightly brushing afterwards. Tough stains can be treated with a mixture of water and a little vinegar on a damp cloth, however this process may cause slight discoloration to the area.