A base tan feels like sun insurance, but the science says it offers almost none. Here is what a pre-vacation tan really does, the SPF it actually equals, and how to build a golden glow without the burn.

Sweat and SPF don't have to fight each other. Here is what water resistant really means, how to keep sunscreen out of your eyes mid-workout, and how to stay protected through every outdoor mile and rep.

Worried that SPF is breaking you out? Here is why sunscreen does not actually cause acne, the pore-clogging ingredients to avoid, and how to choose a lightweight formula that protects without congesting your skin.

SPF 100 sounds twice as strong as SPF 50, but the real difference is tiny. Here's what the SPF number means and what actually matters more.

Yes — UVA rays pass through glass and clouds. Here's when you really need sunscreen indoors and on overcast days, and when you can skip it.