An updated salute to a revolutionary classic, the Keen Terradora Wintershell Hiking Boot will be an enviable addition to your adventure-ready wardrobe. The Keen. Dry and Cleansport NXT technologies ensure a fresh inner climate, while the 200g Keen. Warm insulation offers warmth and protection in inclement weather conditions. Cleansport NXT for natural odor control 200g KEEN. Warm insulation up to -25F KEEN. Dry waterproof, breathable membrane ESS shank offers lightweight support Fused TPU shell