From Xcel

Engineered to perform in and out of the water, with 100% natural built-in bacteria and odor control. Moisture wicking, fast drying, breathable, lightweight 4-way stretch that maintains shape when wet and won’t pill or fade. Cool and comfortable, with unique microfibers that help regulate core temperature. Tested and UPF rated to block 94% of UVA/UVB radiation from the sun. Relaxed t-shirt fit with a soft cotton-like feel.