High capacity pockets snaplock fastener will prevent yout top from riding up during the swim and bike even the back fabric shows the engineering in this garment wind tunnel tested for on bike speed it also provides exceptional cooling while offering upf 16 protection that means that 94 of uv rays are blocked providing a reasonable level of protection but it can be combined with sunscreen for those with sensitive skin ratings out of 5 windproofness 1 out of 5 waterproofness 1 out of