Beaver 43 blocks both UVA and UVB rays. It is not greasy, will not run in or burn your eyes. Beaver 43 goes on easily, and it is waterproof (even though the FDA no longer allows the word waterproof to be used). You can't sweat or swim it off. But it washes off easily with soap and water. One application will still last all day even with water activities. Unlike other sun protection products, many which contain 60 - 80 percent water, Beaver 43 contains NO WATER. Thus much less can be used and will still provide full UV-A and UV-B protection. Designed and tested for the Ironman Tri-Athlons
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