Description Alpha Construction: Built with hand-laid premium, natural rubber over insulating neoprene for durability, flexibility and complete waterproof protection. Plush Fleece Lining: Cozy, soft fleece lines the entire boot for comforting warmth all the way down to your toes. Active Fit: With a comfortable, secure fit to keep your foot in place while on the move, boots with Active Fit also go on and come off with ease. Neoprene Gusset: Durable, neoprene gusset accommodates different calf sizes and makes it easy to slide the boot on and off. Antarctic Outsole: With its rugged, multi-dimensional lug pattern, this premium rubber outsole is designed to keep you on your feet in slippery winter conditions.