The outer panels of the arcticduty overshoes use a 42 mm waterproof sharkskin neoprene to shrug off rain and snow the inside and front panels use 4 5 mm hydrophobic multi stretch nylon neoprene which combines optimum weather protection with excellent fit to add even more protection bbb glue all seams and finish with a waterproof tape to prevent water leakage into the overshoes a neoprene flap behind the rear zipper acts as a protective storm flap helping seal the rear of the overshoe a hook