What does "water-resistant" mean?

     Water-resistant sunscreen is a product that will maintain its declared SPF protection for a minimum of 40 minutes of water immersion. Products that claim to be water-resistant must state on the front label how many minutes of protection (based on standard testing) a user can expect to get of the declared SPF level while swimming or sweating. Two times will be permitted on labels: 40 minutes or 80 minutes.