Description Alpha Construction: Built with hand-laid premium, natural rubber over insulating neoprene for durability, flexibility and complete waterproof protection. 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. Burly Pro Outsole: Our unique tread pattern gives you the traction to move through demanding terrain while chamfered edges keep you fast on your feet by shedding the mud and muck.