5 Things to Know About SPF 50 Sunscreen

SPF 50 blocks 98% of UVB rays, while SPF 100 blocks 99%. That 1% difference is not worth the extra cost or false confidence.

Reapplication matters more than starting strength. Apply a shot glass worth every two hours, regardless of the SPF number.

Water resistance is more important than a high SPF number. Look for “broad spectrum” and “water resistant” labels for 40 or 80 minutes.

Most people apply half the recommended amount. SPF 50 still gives decent coverage if you skimp, but SPF 100 can make you skip reapplication and burn.

Extended outdoor activity depends on reapplying, not starting with a higher SPF. Most sunburns happen from a single morning application with no follow-up.