Searching for waterproof sunscreen? Here's the honest truth: no sunscreen is fully waterproof or sweatproof, which is why FDA rules don't let any brand say so. What you can count on is tested water resistance. Our water-resistant mineral sunscreens carry the label Water Resistant (80 minutes), and we only put it on products with the testing to back it up. So go ahead and dive, snorkel, surf or splash. Just reapply after 80 minutes of swimming or sweating, right after towel-drying, and at least every 2 hours.