Sun Protection

What is UPF?

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UPF - Ultraviolet Protection Factor

Ultraviolet Protection Factor Just like sunscreen, the sun protectiveness of clothing can be evaluated and rated with a measuring system called Ultraviolet Protection Factor (UPF). UPF is a similar concept to SPF; however, UPF rates both UVA and UVB protection, whereas SPF only rates UVB protection. In 1996, the term UPF was devised in Australia as a measure of how much UV penetrates a fabric. UPF is determined by using a UV transmittance analyzer to gauge the spectral transmission of UVB... more
Shawn Allen, MD
Boulder Dermatologist

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