It's normal for those who worship (or even just tolerate) the sun to practice skin sense by using sunscreen liberally, but this precaution may not be quite enough. The sun's radiation is pretty powerful, and has a tendency to skate right on past those thin layers of clothing you're likely wearing. There's no need to panic, but there is cause for concern if you want the best in sun protection. What Is UPF? UPF stands for Ulraviolet Protection Factor, and the term is used in...
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