SPEEDO Women's Swim LeggingsSwimsuits have to contend with some pretty harsh stuff chlorine, perspiration, greasy oils found in sunblock, and stretching from constant use. Designed with those challenges in mind, LYCRAu00ae XTRA LIFE fiber resists deterioration and maintains its shape 5-10 times longer than spandex. That's why it's the new standard in swimwear fabric.Give yourself the right tools for UV protection. Prolonged exposure to UV rays (ultraviolet radiation) in sunlight can lead to serious skin damage. Ultraviolet protection factor (UPF) is a measure of the UV protection provided by a fabric. UV Block the Burn fabric features an excellent UPF rating of 50 , so you can enjoy your time in the sun.