I wear D cups and a large compressed my breasts really well. I have a big stomach, so the binder made my breasts blend in to make them look smaller. My one complaint is that I don't think the people who made this take back fat into account when sizing the product because it squeezes me too much ; if I wear it for longer than 8 hours, I start to get cramps, especially after I eat .After having a mastectomy I wanted to flatten out my remaining breast and corral the fat that was left over on the mastectomy side. This does a decent job. I like the zipper as opposed to velcro or hook and eye closures other tops have. No struggles.I purchased this for my then 11yo when they started asking for one. It took a while to find one that came in a small enough size to be effective on them. We took measurements to make sure it would fit well, and it's perfect. It binds and obscures without obstructing breathing. I don't have to worry about them passing out during P.E. or anything. The covered zipper portion at the top does leave a noticeable lump under a shirt, but they don't mind that at all. They often walk around the house with just this binder on, which is beneficial since our power bill (here in Austin, TX) has been so high we've had to keep the thermostat at 76°.It's breathable. I had to go a size down where I have bigger breast to compress them but it fits great and is very comfortable. I got an XL and I'm a 36 DD. With a 40-41 inch bust. I got it so I could cosplay as a male. This will do nicely.Just barely covered my chest area after a double mastectomy. As short as a sports bra or even shorter. I returned.Got this cause my collection is lacking a zip-up. It’s a nice quality binder; it binds a little less than some of my other hook eye ones but it’s very comfortable.It’s a little tough to get on at first but once you get it the first few times then it’s pretty easy. There’s even a small strip of fabric that hides the zip, which is a considerate touch imo.It’s a good binder, not insane but it’s definitely not bad.My daughter has very large breasts. We stopped measuring her when she got up to a size H cup. She's also five feet, six inches tall. So she gets self conscious. Bra and swimsuit shopping can be a nightmare and often end up with tears. She recently got involved in community theater and is playing the part of a young man. We thought we would give this product a try. We bought the largest size. Upon putting it on, she was thrilled. Her breasts are almost completely flattened and it's not uncomfortable. The look on her face was priceless. One day, I hope we can afford to get her a breast reduction; if she still wants one. Right now, I give this product five stars. Lots of love for women who struggle with large breasts and for folks who are part of the transgender community. I hope you try this out and love it. ❤️I love it, great beginning binder thank youuBought a size under what I thought I'd need (so 2xl instead of 3xl) and it fits perfect. Not too tight not too loose. Amazing. Best binder I've worn so fair.