5'6" 140 lbs. I ordered a size smaller than I understood after reading the reviews. Range) for medium size. It was still a highly anticipated mid-summer purchase for the price , considering all the local stores and big brands had raised their prices to $30 a shirt + sleeve length, although the shirt fits 1 size down a bit loose, it still fits my wrists well and doesn't slip when checking range of motion high on my forearms. I have thin/normal shoulders but long arms (arm span 70.5"). +/- 100% polyester. You may or may not like it. It works fairly well although most athletic shirts I own are 90/10 (polyester/spandex) 90/10 seems to stay tighter on me although not quite as comfortable and comfortable as I'm used to , they still work and were a great alternative to my signature shirts.