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How Does SPF Actually Work, Anyway?

And what's all this UV business?

by Kristin Booker  |  COMMENT

PHOTO 2/8
What's all this 'UV' business?
What's all this "UV" business? The UV stands for ultraviolet, which is the light spectrum of the sun's rays that cause the most damage to human skin. The UV rays that we're most concerned with are ultraviolet A and ultraviolet B, or UVA and UVB, respectively.

UVB rays are the ones that cause sunburns and damage, while UVA radiation is responsible for wrinkles and premature skin damage. The Environmental Protection Agency ("EPA") estimates that 90 percent of skin aging is caused by a lifetime of exposure to UVA rays. Which is where SPF comes in.

Image via Imaxtree

SEE NEXT PAGE: So, what does SPF mean?
 

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