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If you compare the consistency of SPF 30 and SPF 70, the lower number always goes on smoother and is generally easier to rub in. "Many experts recommend starting out at SPF 50 or 70, but they ...
I always recommend a SPF level at or around an SPF 50, as that's the magical number where you are maximizing your UVB protection while using a formulation that is easy enough to rub in and will ...
Beyond SPF 30, the amount of protection slows, making higher SPFs only minimally more helpful, according to Griffin. For example, SPF 15 blocks 93% of the sun’s UV rays, SPF 30 blocks 97% and ...
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 [68] (mg/cm 2). It is ...
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%).