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Look for sunscreen with at least 30 SPF
SPF is a sunscreen product’s sun protection factor, and tells you how much the sunscreen can protect against UV radiation. You can block 97 percent of the sun’s UV rays with a sunscreen of at least 30 SPF.
Spray on sunscreens are not as effective
A spray on sunscreen may be convenient and less work, but they are not as effective as products you have to rub into your skin. This is partly because FDA regulations do not apply to spray on products, and thus do not require the same standards and testing as rub on sunscreens. So if you happen to be using a spray on sunscreen, be sure to use an ample amount and to rub it thoroughly into your skin.
