I spent so long trying to find a solution to wearing a bra with backless dresses--this is perfect for me. I hate padding and "pushup" bras, but wanted support and a little modesty. Sticky bras seemed like the only option that wouldn't show, but they seemed like they were more for adding volume than support. This is cut just right so that it doesn't show in my low back dresses, and the adjustable straps are awesome because you can adjust their positioning until they fall perfectly under the straps of your dress. The material is a lightweight elastic that feels a bit like compression material--just enough to provide decent support. I thought I wanted one of these with a built in shelf bra, but after trying this on, I like that I can fiddle with the positioning of the neckline (up and down) and still get support, instead of being stuck to just the place where the shelf bra would fit. I am 5'5" with a long torso (one-piece bathing suits that fit my width are never long enough), 124lbs, and not particularly perky 34C cup size. I usually wear an extra small in women's clothing and small in junior's clothing, and the large size in this leotard fit me perfectly. I'm so excited to be able to wear my fancy dresses, look put together, and feel totally comfortable.