What Is SPF and What Does It Mean?

SPF is the amount of sun that is allowed through. If you have SPF 15, that means one 15th of that sun is it able to get through your skin. With SPF 30, it's one 30th SPF 100. So it's the low part of the fraction basically. One 15th one 30th one 50th or whatever. Mm hmm. Oh, I did also want to say there could be some even though it might not be dangerous for sunburn and sunscreen for UVA can cause some skin aging like wrinkles.

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