Introducing the ultimate winter boot, with targeted insulation, a breathable waterproof membrane and a rugged rubber sole that reacts to cold weather by hardening for a tough grip on packed snow. – 300g KEEN.WARM upper insulation – 450g KEEN.WARM toe insulation – KEEN.DRY waterproof breathable membrane – Shellback heel support – Material: Waterproof nubuck leather upper; Dual climate non-marking rubber outsole; Compression molded EVA midsole; Removable thermal heat shield footbed – Weight: 27.6 oz / 781.9 g – Calf Circumference: 13.5 in / 34.3 cm – Collar Height: 9.5 in / 24.1 cm – Care: 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. This process may cause slight discoloration to the area.