What is SPF? SPF stands for sun protection factor. This rating is used to determine how sunscreens block UVB rays. SPF 30 blocks 96.7% UVB rays, and SPF 50 blocks 98% of UVB rays. Let's discuss SPF in more detail. Here are some examples. What are the benefits of SPF http://bestspfmoisturiser57131.blogproducer.com/16192437/best-spf-face-moisturiser-like-a-pro-with-the-help-of-these-ten-tips