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Posted by http://www.skincancer.org/prevention/sun-protection/clothing on May 18th 2017

Ultraviolet Protection Factor, Why it matters.

What Is UPF?UPF stands for Ultraviolet Protection Factor. It indicates what fraction of the sun’s ultraviolet rays can penetrate the fabric. A shirt with a UPF of 50, for example, allows just 1/50th o …

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