Winter offers plenty of chances to get outside, and whether you're pulling sleds full of munchkins up the hill or cruising the snowy trails behind the house, Keen's Koven Polar Men's Boot will keep your feet warm and dry. The upper is made of supple but tough leather and textile, but it's been laminated to a waterproof and breathable KEEN. Dry membrane, so snow won't get in and sweat won't build up. Just as importantly, Keen lined the Koven with KEEN. Warm synthetic insulation, which traps heat close to your skin, and lined it with fleece for an extra shot of comfort and insulation. If that doesn't sound warm enough for adventures over frozen ground, don't worry, because there's also a removable Thermal Heat Shield footbed, which reflects heat, insulates your feet from the ground, and offers cushy comfort while you're on the move. The Koven's dual climate rubber sole provides killer grip whether the ground is frozen or starting to get sloppy, and the laces snug up tightly for a comfortable, slip free fit that'll have you covering ground all winter long.