INTENTIONAL VS. INCIDENTAL EXPOSURE
When it comes to protecting yourself against sunburn, it is important to make the distinction between intentional and incidental sunlight exposure. Concerning intentional exposure, this usually deals with outdoor activities that typically require direct contact with sunlight for long periods of time. These recreational activities can include swimming, running, sports, and hiking. People tend to do these activities between 10 am and 4 pm, the time of day with the highest potential for sunburn. Because these activities tend to involve excessive sweating or contact with water, the products that protect your skin from ultraviolet radiation are designed to stay on regardless of those factors. They do this by using polymer and emulsifiers, creating a film that locks the ultraviolet filters onto your skin.
– See more at: http://www.skininc.com/skinscience/ingredients/Anatomy-of-a-Sunscreen-370696051.html#sthash.h5GM733K.dpuf
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