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Sunscreen, also known as sunblock, [a] sun lotion or sun cream, is a photoprotective topical product for the skin that helps protect against sunburn and prevent skin cancer. Sunscreens come as lotions , sprays, gels, foams (such as an expanded foam lotion or whipped lotion [ 4 ] ), sticks, powders and other topical products.
What does SPF mean — and which one should you use? The SPF, or sun protection factor, measures how well sunscreen protects against sunburn , according to the American Academy of Dermatology (AAD).
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%).
A UV index reading of 3 to 5 means moderate risk of harm from unprotected sun exposure. Stay in shade near midday when the sun is strongest. If outdoors, 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 ...
Sunscreens are creams, lotions, sprays, gels, sticks, or other topical projects that protect the skin from the sun. They contain organic or inorganic filters that act to absorb or reflect harmful UV radiation. [26] Sunscreens are marked with 'spf', which means 'sun protection factor.' This shows that a product provides protection against UVB. [26]
Sun protection factor, of sunscreen; Specific-pathogen-free, laboratory animals known to be without pathogens; Superplastic forming, of sheet metal; Space Power Facility, a NASA test facility; S-phase-promoting factor, in biology; Formal spectrum of a ring, a construction in algebraic geometry; Spray polyurethane foam, a building insulation ...
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Cream deodorants are usually applied with the fingers instead of through the container, so it can be messy to apply, but more moisturizing for the skin then other application options.