High back underbust corset with shoulder straps Real spiral steel boning, excellent flexibility and strength, can really feel it pushing my insides in and snatching me inside and out, I’ve been able to achieve a waist reduction of 2 whole inches, certainly sturdier than your average Amazon corset. It looks great both above and underneath clothing, feels comfortable against the skin and surprisingly breathable! The high back coverage and shoulder straps are such a unique look, with the satin finish it makes me feel imposing, sophisticated… Outer Material: 100% Satin Polyester Lining: 85% Polyester 15% Cotton Twill 4mm Lightweight Spiral Steel Bones, 7mm Lightweight Flat Steel Bones Busk Length: 10"