There's no such thing as waterproof or sweatproof. It's technically impossible for a sunscreen to be waterproof or sweatproof, says the FDA. Instead, sunscreens can be water-resistant, but only if they retain their original SPF (Sun Protection Factor) after 40 minutes in water.
Credit: Ian McDonnell / Getty Images
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Style & Design 2014
Tech, Tools, Toys & the Hottest New Gear
Plus: When to Say No to Your Doctor
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