It's OK medical infusion technologies savannah ga Dr. James Spencer, a dermatologist in St. Petersburg, Fla., and a board member for the American Academy of Dermatology, says that for those who are very sun sensitive, a white cotton T-shirt will likely not provide enough protection. Instead, Spencer recommends finding a shirt in a tighter weave or washing clothes with a sun protection rinse such as SunGuard wash, which claims to make clothes have a UPF of 30.