You can protect yourself from the sun with physical blocks such as the umbrellas pictured here, with clothing that has an SPF rating, and with chemical sunscreens that you apply to your skin.
Sunscreen Protection Factor, or SPF, is the measure of protection a sunscreen will give you from the sun’s UVB rays. (There is currently no standardized measure of protection for UVA rays) It works like this: If your unprotected skin burns in 20 minutes, a sunscreen with an SPF of 15 will protect your skin 15 times longer - in this case, about 5 hours.
Products containing an SPF of 15 block approximately 93% of the sun’s UVB rays.
Products containing an SPF of 30 block approximately 97% of the sun’s UVB rays.
Products containing an SPF of 50 block approximately 98% of the sun’s UVB rays.
Products with higher than an SPF of 50 provide negligible additional protection and no sunscreen will protect you from 100% of UVB rays.
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