Nimbus Snowmobile Boot is the top-of-the-line backcountry snowmobile boot. This premium snowmobile boot utilizes 1200 grams of insulation and the Sympatex® membrane makes it 100% wind & waterproof. The revolutionary 2-in-1 design of this boot offers incredible functionality. First, the inner boot is soft and well-cushioned for a long, comfortable ride. Secondly, after a few hours of wearing these boots, the natural heat given off by your body custom-molds the inner boots to the shape of your feet.