The material has a nice stretch without sacrificing binding capability, and the back of the binder is fully mesh so you don’t feel like it’s absolutely sticking to you. I love that it’s easier to take off than a solid (no zip, no clasp closure) binder too.For reference I’m about 5’5, 5’6, 120 lbs, and i have probably an A cup chest? Not enough to have too much trouble binding, but noticeable if I wear tighter clothing so I need a binder. It gets me nice and flat, and did amazingly during my trip to Cambodia—heat and humidity? This thing felt fine.If you ever get too hot or sweaty, you can always unzip it a bit to let your chest relax and breathe, and zip it right back up again. You can’t see it under dress shirts either, so I’d highly recommend it as a trans person!Beware of wearing it under tighter clothing or materials — you can sometimes see the outline of the neck or the bottom, as well as the zipper, underneath shirts, so if that bothers you, opt for something more low profile. This is pretty low but it is not totally invisible.