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  2. We asked a dermatologist the most common questions about SPF ...

    www.aol.com/lifestyle/asked-dermatologist-most...

    Dr. Linkner: The most important part of a sunscreen label is the SPF or the sun protection factor level which gives you the interval time frame of which the sunscreen will prevent you from ...

  3. Does sunscreen expire? Should you wear it indoors ... - AOL

    www.aol.com/lifestyle/does-sunscreen-expire-wear...

    According to the MD Anderson Cancer Center, an SPF 15 sunscreen blocks 93% of the sun’s harmful UVB rays, and SPF 30 blocks 97%. Once you get higher than that, you’re only getting a small ...

  4. 3 dermatologists explain why you still need to wear sunscreen ...

    www.aol.com/lifestyle/3-dermatologists-explain...

    The American Academy of Dermatology recommends using a sunscreen that offers a minimum protection of SPF 30, broad-spectrum coverage so it will properly defend against UVA and UVB rays, both of ...

  5. Sunscreen - Wikipedia

    en.wikipedia.org/wiki/Sunscreen

    The UVA seal used in the EU A tube of SPF 15 sun lotion. As part of revised guidelines for sunscreens in the EU, there is a requirement to provide the consumer with a minimum level of UVA protection in relation to the SPF. This should be a UVA protection factor of at least 1/3 of the SPF to carry the UVA seal. [90]

  6. What to Know About Mineral and Chemical Sunscreens ... - AOL

    www.aol.com/heres-know-mineral-chemical...

    While both types of sunscreen protect against the sun's harmful rays, the two differ in terms of how long their protection actually lasts. ... Does SPF really matter? ... you should use SPF 30 or ...

  7. Sun protective clothing - Wikipedia

    en.wikipedia.org/wiki/Sun_protective_clothing

    UPF (ultraviolet protection factor) represents the ratio of sunburn-causing UV without and with the protection of the fabric, similar to SPF (sun protection factor) ratings for sunscreen. While standard summer fabrics have UPF ~6, sun protective clothing typically has UPF ~30, which means that only 1 out of ~30 units of UV will pass through (~3%).