I am 5ft 5in and 126lbs. I ordered medium because I was afraid they would be very tight but they are not. I will return them for the size Small. If you're about my height and I want a tighter fit, go down a size. Medium is ok if you want a looser fit. Elastic. I've noticed that they make me heat up and sweat a lot easier than a cotton shirt, so that's disappointing. The only real quality issue is the black shirt. After the first wash, I noticed red fibers were coming out of the shirt. I'm assuming it's elastic. It's hard to tell from the photos, but it definitely looks weird. I plan to order a size S and will probably try to get the package without the black shirt.
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