In short, the study showed that SPF 100 is 11 times more effective at preventing sunburn than SPF 50 - and that’s impressive to say the least. Sunscreen works to shield skin from the UV ...

Level of protection against sunburn producing rays. Score based on the SPF range found in our tests. Approximate ranges for tested SPF: Greater than 40 (excellent), 30-39 (very good), 20-29 (good ...