It takes one bad sunburn to make you realize that sunscreen isn’t always enough. That’s why dermatologists recommend investing in clothing with UPF (ultraviolet protection factor). It’s an extra layer of defense from the sun, and unlike sunscreen, doesn’t need to be reapplied frequently.

But how does UPF work? And what should you look for when shopping for sun protective clothing and swimwear? We spoke with experts to find out — and rounded up some top-rated pieces for men, women and kids based on their advice.

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