Originally Posted by Silver
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Although I have serious questions on whether this "basic white cotton T-shirt" really has an SPF of just 7. Because on days when the burn factor is a 10, an SPF 7 would allow you to stay in the sun for a maximum of 70 minutes. But I've spent HOURS in the sun in a plain white tee and still, never burned under it. 
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Yeah, that's why I was saying it may also be the thickness of the T shirt. I would think only extremely sun sensitive people would have a problem.
Personally think the SPF in swim wear is just a gimmick.