BBB SpeedFlex Overshoes - Designed to offer the best protection against the rain. - Extra tough and durable Kevlar reinforcements on shoe cover heel and nose. vanced 2 mm WaterFlex material, outer polyurethane (PU) rubber with - The inner MicroFleece give the highest level of water-resistance, flexibility and durability. - Ergonomic two panel design provides a minimum length of seams and a perfect fit. - Reflective industrial-strength zipper. - Reversed zipper for the best performance in extreme weather. lcro rubber strap for a secure fit.