Laromcy Steel Boned Steampunk Tesla Underbust Corset Waist Training Cincher Our size is not standard US Size. Corsets are sized by waist size, so please choose your corset according to your waistline, not your bust. Our Overbust corsets will fit any body shape provided your bust measurement (at the fullest part) is 4-14 inches greater than your waist measurement. Otherwise we advise you choose Underbust Corset. 12 flexible spiral steel bones throughout. Full spiral steel boning along with strong steel busk fastening to give the best shape and support. Fully adjustable criss cross ribbon laced back, please try to adjust it to be more fit for your body. Material: 90% polyester and 10% spandex. Excellent for both fashionable wear and waist training.