For your reference, it's 100% polyester! However, I only received them today and I already like wearing them around the house. I'm 6ft 1in, 215lbs, muscular and Xlarge fits me perfectly. I don't like tight clothes, especially for the gym. In general it's roomy for me, just fits well and I like the pocket on the front to put my phone in while working out. Will it be easier to quickly change the volume on my headphones. The armholes have a nice cutout, big enough to show off the arms and partial pecs, but they don't open all the way down making you look like a jerk. They look good and I think I'll see how they hold up after a few workouts and washes.
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