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
Powered By ZergNet
Gear of the Year
102 of the Best Tools, Toys & Tech
Plus: The Woman Who Bails Out the NFL's Bad Boys
ON NEWSSTANDS NOW
Joby Ogwyn: The Man Who Fell to Earth
Life Advice from John Cleese
Sign up to receive the Men’s Journal newsletter and special offers from MJ and its marketing partners.