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.
This Year's Best Gear
From toys and tools to gadgets and four-wheel fun, we give you the rundown of the most exciting new goods.
Plus: A Look Inside the Global Ivory Trade
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