Designed to offer the best protection against rain. WaterFlex material, featuring a polyurethane (PU) rubber exterior with an inner microfleece lining. Water-resistant, flexible, and durable. The 38 mm wide Velcro strap allows these over shoes to be used for (inline) skates. All seams are covered internally with waterproof tape. There are two reinforced sections between the sole and the zipper, as well as at the front. Industrial strength YKK zipper.