Rubber/Neoprene Imported Patented AeroForm technology delivers revolutionary comfort and durability in a markedly quiet boot AEROFORM SHELL Made of the same material used to insulate refrigerators and freezers, our polyurethane AeroForm Shell wraps the entire foot for cushioning comfort and warmth. It is ultra - light and flexible and won't crack, tear or Fade. FLEXIBLE NEOPRENE Not only does this create a more comfortable Waterproof boot, it can easily be rolled down to keep you cooler when the Temperature rises and dry quicker when it's time to take them off. COMFORT LINER Quick drying and moisture wicking, our jersey knit liner will keep your feet Dry and Comfortable. AERO SPORT OUTSOLE This all-season outsole with non - loading tread is built to take on the rugged Outdoors. Molded kick-off heel plate for easy hands - free removal. Active Fit with adjustable Neoprene gusset for easy on/off and a secure, comfortable fit on foot. Heavyweight comfort has never been so light. The AeroHead Sport completely changes what a rubber hunting boot can be by replacing the rubber shell with one made of extremely durable, lightweight and insulating polyurethane. Designed for optimal fit and flexibility, the waterproof AeroHead Sport is built for ultimate comfort and will keep hunters light on their feet. Its Brush Tuff material stands up to unforgiving brush and briers while an abrasion resistant shin guard offers extra protection without added bulk.