What is SPF? SPF stands for sun protection factor. This rating is used to determine the extent to which sunscreens block UVB rays. SPF 30 blocks 96.7 percent UVB radiation, while SPF 50 blocks 98% UVB rays. Let's discuss SPF in more detail. Here are some examples. What are the https://www.topscosmetics.uk/product-category/skincare/moisturisers/spf-moisturisers/