These fabrics are tested by the Australian Radiation Protection Agency and block 97.5% of the sun’s ultroviolet rays. Ultraviolet radiation, or UV, is present in sunlight. The Ultraviolet Protection Factor (UPF) shows how well a fabric protects your skin from solar UV. But remember, a Wallaroo hat only protects the skin it covers. Safeguard the rest of your body by wearing sunglasses and sunscreen.
http://www.hatsandvisors.co.uk/categories/UPF-50%252b-Hats/
