This boot features rubber-clad neoprene for lightweight comfort with 100% waterproof protection, naturally insulating 3.5 mm. neoprene. They are 100% ozone resistantand have nylon woven lining for moisture management and adjustable gusset in calf area. The Alpha Axle boot has a slip resistant Chevron outsole for traction on most surfaces, an EVA footbed, and fiberglass shank.