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SPF 100 vs SPF 50 - Is Double the Number Actually Double the Protection?

SPF 100 isn't twice the protection of SPF 50 - here's what the numbers actually mean Do you reapply sunscreen every two hours or just once and forget?

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SPF 100 isn't twice the protection of SPF 50 - here's what the numbers actually mean Do you reapply sunscreen every two hours or just once and forget?

Transcript

SPF 100 sounds like double the protection - it isn't. SPF measures how much UVB gets blocked - not total protection. SPF 50 blocks about 98% of UVB - SPF 100 blocks roughly 99%. That's it. What matters more is reapplying every two hours, whatever SPF you choose. Follow so you catch the next one - there's more like this.