KEEN Men's Revel IV Waterproof Insulated ChelseaBrave the from frozen trails or city streets in the insulated Revel Winter Chelsea Waterproof full grain leather upper sourced from LWG rated tanneries Non marking multi directional lugged outsole with KEEN. POLAR Traction for better grip on ice and snow 200g of KEEN. WARM Recycled P. E. T. insulation rated to 25F 32C Thermal Heat Shield insole with a thermal foil barrier to keep the cold out and heat in bay harnessing radiant heat Heat Trapolator