High quality steel boning contours your waist into an hourglass shape. Adjust to your desired level of compression. PLEASE READ: This garment is built with LESS stretch than most Honeylove garments, so if you're in between sizes, we STRONGLY recommend SIZING UP. The Cincher features three rows of hook and eye clasps that allow you to adjust your sizing. Hook the garment at your prefered level of compression BEFORE putting it on, as you won't be able to pull the hooks closed once it's on your body. Instead, use the zipper on the side of the Cincher to take the garment on and off. If the garment is too tight or too loose, remove it by unzipping the side zipper, and THEN re-hook the Cincher at your prefered sizing level while it's off your body. Body: 58% Nylon, 42% Spandex • Lining: 100% Nylon