“I ordered the large since other reviews said these run small, very pleased with the fit of the large. I am 5'5" and weigh 130 pounds, normally wear medium. Wore the T today in high humidity and on a heavy gnat & mosquito day here in the West Virginia forest. Worked like a charm on my "bug magnet" bite-infested self! Will be buying more. Highly recommend for fellow "bug magnets"!”