I am 5’9 and 135lbs, but the small is still a bit larger than to my liking. Re-gifted to a friend who is 5’11 and 170lbs, which he fits perfectly. So I’d say the size runs a bit larger. The fabric is smooth and silky, though it feels a bit like an Asian grandma’s clothes fabric (which I supposed is very breathable and comfortable), it just feels a bit dated to my liking.