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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? The SPF, or sun protection factor, ... For example, SPF 50 stops 98% of UVB rays, while SPF 100 blocks 99% of them. No sunscreen provides 100% ...

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

   In the EU, sunscreen labels can only go up to SPF 50+ (initially listed as 30 but soon revised to 50). [73] Australia's Therapeutic Goods Administration increased the upper limit to 50+ in 2012. [74] [75] In its 2007 and 2011 draft rules, the US Food and Drug Administration (FDA) proposed a maximum SPF label of 50, to limit unrealistic claims.

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. Ultraviolet index - Wikipedia

   en.wikipedia.org/wiki/Ultraviolet_index

   Reduce time in the sun between 10 a.m. and 4 p.m. If outdoors, seek shade and wear sun-protective clothing, a wide-brimmed hat, and UV-blocking sunglasses. Generously apply broad spectrum SPF 50+ sunscreen every 1.5 hours, even on cloudy days, and after swimming or sweating. Bright surfaces, such as sand, water, and snow, will increase UV exposure.

7. 19 Best Drugstore Sunscreens to Protect Your Face From ... - AOL

   www.aol.com/19-best-drugstore-sunscreens-protect...

   What does SPF mean? ... Sun Age Defense SPF 50 Face Sunscreen Lotion with Hyaluronic Acid, Facial Sunscreen with 5 Antioxidants, If your skin is feeling a little parched, grab Eucerin Sun Age ...