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2. SPF 100 might actually be better for you than SPF 50 - AOL

   www.aol.com/article/lifestyle/2018/05/25/spf-100...

   Find out why you need to seriously up your SPF -- hint, it has to do with how you are applying your sunscreen!

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. The 13 Best Face Moisturizers With SPF for Every Skin Type - AOL

   www.aol.com/13-best-face-moisturizers-spf...

   SPF: 40. Dermstore rating: 4.7/5 stars. Our expert says: “Elta Daily Tinted SPF is a lightweight moisturizing sunscreen (SPF40) with a transparent tint to help even skin tone. It’s loaded with ...

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. Sunscreen - Wikipedia

   en.wikipedia.org/wiki/Sunscreen

   UV sunlight spectrum (on a summer day in the Netherlands), along with the CIE Erythemal action spectrum. The effective spectrum is the product of the former two. The SPF can be measured by applying sunscreen to the skin of a volunteer and measuring how long it takes before sunburn occurs when exposed to an artificial sunlight source.

7. Sun tanning - Wikipedia

   en.wikipedia.org/wiki/Sun_tanning

   In 1978, both sunscreen with an SPF 15 rating as well as tanning beds first appeared. In 2007, there were an estimated 50,000 outlets for indoor tanning; it was a five-billion-dollar industry in the United States, [ 46 ] and had spawned an auxiliary industry for indoor tanning lotions including bronzers, intensifiers, and accelerators.