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What is the sun protection factor (SPF) of hair?

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One can't answer your question exactly because "it depends" is the correct answer. What I can say is that indeed hair does protect the skin to some extent. Non-melanoma skin cancers are much less common in areas of the scalp covered by hair than they are in hairless areas (including the bald scalps of men). read more

SPF stands for Sun Protection Factor. The number is determined experimentally indoors by exposing human subjects to a light spectrum meant to mimic noontime sun. Some subjects wear sunscreen and others do not. read more

SPF, or Sun Protection Factor,is a measure of how well a sunscreen will protect skin from UVB rays, the kind of radiation that causes sunburn, damages skin, and can contribute to skin cancer. If your skin would normally burn after 10 minutes in the sun, applying an SPF 15 sunscreen would allow you to stay in the sun without burning for approximately 150 minutes (a factor of 15 times longer). read more

SPF stands for Sun Protection Factor. Simply put, an SPF rating tells you how long you can stay in the sun without getting burned while wearing that sunscreen, compared with how long you can stay in the sun before you burn without wearing that sunscreen. read more

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