Mini Girls UV Pink Fiesta Short Sleeve. Rash vest from Rip Curl. Quick drying super soft fabric, the rash vest can be worn under a wetsuit as a base layer or even a lightweight top by itself. Rip 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.