UPF (ultraviolet protective factor) is the standard measurement for ultraviolet radiation (UVR) penetration for fabrics. A UPF 50 fabric will allow only one fiftieth (1/50) of the ultraviolet radiation through it. UPF ratings and protection categories are as follows.

The previous chart is based on the Australian Standard for Sun Protective Clothing, which were established in July 1996. The Standard, developed jointly by Australia and New Zealand, states that the highest UPF rating garments may be labeled with is 50. Garments made from fabrics with ratings higher than 50 are labeled as UPF 50+. Australians have the highest rate of skin cancer in the world, due to high UVR levels and fairly clear skies.

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