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2. 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). It is ...

3. Moisturizer - Wikipedia

   en.wikipedia.org/wiki/Moisturizer

   Water loss through the skin is normally about 4–8 g/(m 2 ⋅h). A layer of petrolatum applied to normal skin can reduce that loss by 50–75% for several hours. [4] Oils naturally produced by the human body moisturize through this same mechanism. [2] Humectants are hydrophilic and absorb water. They absorb water from humid air (when >70% ...

4. This derm-approved moisturizer is the secret to a younger ...

   www.aol.com/lifestyle/elemis-pro-collagen-marine...

   The SPF version of this same moisturizer comes highly recommend from dermatologists I've spoken with for its ability to protect aging skin while dialing back the clock on wrinkles and fine lines ...

5. Nivea - Wikipedia

   en.wikipedia.org/wiki/Nivea

   Nivea (German pronunciation: ⓘ, [1] [2] stylized as NIVEA) is a German personal care brand that specializes in skin and body care. It is owned by the Hamburg-based company Beiersdorf Global AG. This was the origin of the Eucerin brand. Nivea comes from the Latin adjective niveus, nivea, niveum, meaning "snow-white". [3]

6. 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%).

7. Ultraviolet - Wikipedia

   en.wikipedia.org/wiki/Ultraviolet

   [70] [71] The amount of sunscreen that penetrates into the lower layers of the skin may be large enough to cause damage. [72] Sunscreen reduces the direct DNA damage that causes sunburn, by blocking UVB, and the usual SPF rating indicates how effectively this radiation is blocked. SPF is, therefore, also called UVB-PF, for "UVB protection ...