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2. 9 best beach umbrellas to shade you all day - AOL

   www.aol.com/news/9-best-beach-umbrellas-shade...

   The best beach umbrellas provide shade and sun protection. Shop Tommy Bahama, Frankford, Neso, Ammsun and more.

3. Add Ample Shade to Your Backyard With These Designer-Approved ...

   www.aol.com/lifestyle/best-cantilever-umbrellas...

   11' LED Round Offset Patio Umbrella. This 11-foot, octagonal canopy is made with UV-protected fabric and vented for wind. The steel pole is rust-resistant and will stand up to the elements.

4. These Patio Umbrellas Add UV Protection to Your Patio - AOL

   www.aol.com/lifestyle/patio-umbrellas-add-uv...

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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

   The sun protection factor (SPF rating, introduced in 1974) is a measure of the fraction of sunburn-producing UV rays that reach the skin. For example, "SPF 15" means that 1 ⁄ 15 of the burning radiation will reach the skin, assuming sunscreen is applied evenly at a thick dosage of 2 milligrams per square centimeter [ 65 ] (mg/cm 2 ).

7. Ultraviolet index - Wikipedia

   en.wikipedia.org/wiki/Ultraviolet_index

   A UV index reading of 6 to 7 means high risk of harm from unprotected sun exposure. Protection against skin and eye damage is needed. 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.