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

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

   What does SPF mean — and which one should you use? ... For example, SPF 50 stops 98% of UVB rays, while SPF 100 blocks 99% of them. No sunscreen provides 100% protection from damaging UV rays.

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

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

   As SPF levels increase beyond 50, the formulations tend to be thicker and leave a chalkier appearance, and most people will under compensate that white chalkiness by not utilizing the right amount ...

4. Sunscreen - Wikipedia

   en.wikipedia.org/wiki/Sunscreen

   Sunscreen is inherently anti-ageing as the sun is the number one cause of premature ageing; it therefore may slow or temporarily prevent the development of wrinkles, dark spots, and sagging skin. A tube of SPF 30 sunscreen on sale in the United States

5. 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%).

6. Your favorite sunscreen is a tube of deception, and SPF is a ...

   www.aol.com/article/2016/05/17/sunscreen-spf-big...

   Even if an SPF 100 sunscreen allegedly protects you for 100 times longer, it can still get rubbed off — especially when you sweat or swim. ... SPF 100 blocks 99% of UVB rays, while SPF 50 blocks ...

7. SPF - Wikipedia

   en.wikipedia.org/wiki/SPF

   SPF may refer to: Science and technology. Sun protection factor, of sunscreen; Specific-pathogen-free, laboratory animals known to be without pathogens;