Waterproof sunscreen lasts about 80 minutes — then you’re getting burned.

The FDA won’t even let companies call it “waterproof.” It’s “water-resistant,” and that label only means it passed a test for 40 or 80 minutes of water exposure. After that, protection drops fast.

Sweat counts as water. Toweling off counts as removal. Even if you don’t swim, hitting the 80-minute mark means it’s time to reapply. The SPF doesn’t magically recharge itself.

If you’re actually swimming or sweating heavily, I’d reapply every 60 minutes. Your skin doesn’t care about the label — it cares about UV rays.