Waterproof means the product will not come off in water. In other words, it’s not water-soluble. It will continue to remain on the skin even after sweating, taking a dip in the pool, or jumping in the ocean. I believe anyone participating in any outdoor activities should wear waterproof sunscreen. Anything else will quickly and easily come off at the first sign of sweating or immersion in water.
What’s the difference between waterproof and water-resistant? The difference between the two is basically this: a waterproof product must maintain its SPF rating (SPF 15, for instance) for 80 minutes in water in order to be called waterproof. A water-resistant product must maintain its rating for at least 40 minutes in water. Whichever you choose to use, if you are sweating profusely or are in and out of the water frequently, you really need to reapply your sunscreen.
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