Sun protection factor better known as spf. Spf is the amount of time you have before the damaging UVA and UVB rays will pentrate the skin and breakdown elasticity and collagen. Take the spf number says its 30...so 30X3=90..90 minutes that's how long you have until you need to reapply. Use a Broad Spectrum one that has dual physical ingredients that will reflect the damaging rays and keep them from penetrating the skin. Just do it please.\
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