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Step 1
Make sure the sunscreen protects against UVA and UVB light wavelengths, as recommended by REI, a camping and outdoors specialty store. Check the bottle to learn what types of UV light for which the sunscreen is designed. Most sunscreens will feature UVB protection to shield skin from sunburn. Only certain products also feature equally important UVA protection to shield skin from deep-penetrating, long-term damage.
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Step 2
Look for the most effective FDA approved UVA blocking agents on the market. Check the sunscreen's label for avobenzone, ecamsule, zinc oxide or titanium oxide ingredients. REI explains that these four ingredients are the most effective among the 17 FDA approved UVA blockers.
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Step 3
Read the label to make sure the sunscreen does not use para-aminobenzoic acid (PABA). PABA used to be a common ingredient but now it is rarely used. A few select brands still contain this ingredient. PABA can cause allergic reactions and generally should be avoided.
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Step 4
If swimming or vigorous physical activities are planned, consider waterproof brands of sunscreen. Otherwise, non-waterproof brands are sufficient and less expensive.
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Step 5
Determine the most appropriate SPF rating for your needs. SPF 15 will work well for a short, casual outing in the backyard. An extended stay outside will require SPF ratings from 30 to 50. A rating of 30 is a good general-purpose sunscreen, allowing you to hike, camp or even swim for hours on an average day without sun damage. For intense, extra-sunny days, or to protect delicate skin or children's skin, a rating of 45 or 50 is ideal. Keep in mind that a higher SPF rating will feel more "gooey" and thick on the skin.
