If This SPF Goes Any Higher, My Sunscreen Will Turn Into Aluminum Foil

If This SPF Goes Any Higher, My Sunscreen Will Turn Into Aluminum Foil

The difference in UVB protection between an SPF 100 and SPF 50 is marginal. Far from offering double the blockage, SPF 100 blocks 99 percent of UVB rays, while SPF 50 blocks 98 percent. (SPF 30, that old-timer, holds its own, deflecting 96.7 percent).