alt Hacker NewsWhile generally true, it's worth remembering that thin shirts can have an SPF as low as 50 or so, which isn't much.
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hollerith • today at 3:20 AM
It means only 2% of the harmful rays (UVA) are getting through the shirt or alternatively the skin under the shirt can spend 50 times as long in the sun as it could without any protection.
tabletcorry • today at 4:27 AM
A typical tshirt is closer to SPF 7, depending on color and weight.
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SPF is logarithmic so high numbers can be misleading. The FDA has recently banned labeling above SPF 60 for this reason. Doctors usually recommend 30