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Ultraviolet Protection Factor, Why it matters.

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

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 … read more