After two serious "sunburns" and two ruin vacations, I figured out that my sunburns were actually chemical burns from the liberal use of sunscreens. After receiving my TropicSport SPF 30, I set out to test it in the Texas summer sun and heat seeing if my skin reacted in its usually way. IT DID NOT, after 3 days of pool lounging in mid-day sun, with some other doctor recommended sunscreens on one side, my skin felt warm to the touch and was pinky-red. With TropicSport, my skin was cool, with no color at all - this was impressive! I tried to get sunburned just to make sure this product worked and it didn't let me! I am hoping it works as well for me in ocean. Next cruise, I am buying the mega bottle and will be using it every time I am in the sun or water. It may be a little expensive, but you don't have to use a lot to get good coverage. Yes ,it turned my skin a milky film, but that is better than chemical or sunburn any day. Doesn't have an strong scent, and the lip balm worked just as well. So far, I am pleased with this product. The best part is that it is reef safe...!