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"When the light hits the material, it has three choices. It either transmits through it, reflects, or absorbs," said Salimeh Tofighi, a research assistant at UCF's College of Optics and Photonics. We brought four t-shirts with us and used their machines to measure the transmittance of UV light through each clothing sample. The first shirt we tested was a Hanes Cool DRI long sleeve t-shirt from Walmart.com. It is 100 percent polyester and has a UPF rating of 50+, and it cost about $10. "As you can see, it transmits less

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