Sunscreen

Sunscreen is able to absorbs or reflects some of the sun's ultraviolet (UV) radiation on the skin exposed to sunlight and thus helps protect against sunburn. To absorb UV radiation sunscreens contain organic or inorganic particulate governed to about 90% by absorption and 10% by scattering of UV light. In addition, many sunscreens are waterproof, to keep the effect while swimming.
Many sunscreens do not block UVA radiation, which does not cause sunburn but can increase the rate of melanoma. Additionally, sunscreens block UVB, and if used consistently this can cause a deficiency of vitamin D.

@B View advertising of Extreme Waterproof