The speedo aqua v silicone swimming cap is a unique multi density racing cap that is proven to reduce drag by up to 5 compared to a standard latex swimming cap the super tight and comfort fit design reduces drag by the optimum amount to ensure the water passes freely over the head and allows you to glide through the water faster the thick section through the top guarantees the cap is wrinkle free and significantly reduces resistance in the water while the mid section allows the cap to stret