Mini Girl UV protective UPF 50+ sun suit Short Sleeve Purple from Rip Curl. Quick drying super soft fabric.Curl ensure that all their materials are laboratory tested and are certified as having a 50+ UPF rating, which is the highest protection rating available for fabrics. Standard summer fabrics often have a UPF rating of around 6. UPF stands for Ultraviolet Protection Factor. A UPF rating of 50+ will usually block out 97.5% – 98%+ of UV, which are the harmful rays produced by the sun.