The Speedo Women's Swim Tee is great for in and out of the pool. The Tee is made from 100% polyester fabric for fast drying and durability. 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, so you can enjoy your time in the sun.