Sizing: I am 5’ 4” and 153 lbs. My waist is 30”, the widest part of my hips measure 41”. That being said, I went with the waist measurement that was listed and bought myself a S/M. It fits like a glove.Putting it on: Yes, it’s hard to put on. I’ve figured out the best way to get it on is to pretend you’re a toddler and your mom is getting you dressed. Put your head completely in first. Then your right arm. Then get as much as your left arm in as you can before using your right hand to grab your left wrist and pull. Good luck. Getting it off is a whole new challenge.Does it work: This isn’t a miracle weight loss tool. It’s designed to make you sweat, and it definitely does it’s job.On an intellectual level: it makes you sweat. It heats up your core, which in turn has your heart working harder. Be sure your endurance is ready for this because it’ll definitely make your workouts tougher. Are you burning more calories? Probably. Are you burning fat? Well, yeah, if you’re working out. But the shirt is mainly helping you lose water weight.On an emotional level: Seeing all that sweat just leaking off the clothes and your body is disgusting. But also really satisfying after a good workout? I took a before and after photo of myself and no one is going to see a difference. BUT I saw the slightest difference and in the end, that was such a confidence booster and isn’t that really what it’s all about? The next morning when I stepped on the scale, there was a larger than normal dip. I know it’s water weight and it’ll just come back, but like I said. Confidence booster.