Designed to offer optimal protection against rain. The WaterFlex material features an outer layer of polyurethane (PU) rubber with an inner microfleece lining. It is water-resistant, flexible, and durable. The 38 mm wide Velcro strap allows these cover 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. It comes with an industrial-grade YKK zipper.