80% Neoprene + 20% Nylon waist trainer girdle, comfortable and offers great performance on burn your fat.S-6XL size available, please kindly check carefully our sizing chart, due to everyone have different figure, please choose a correct size according our size chart after measuring your waistline. Make the vest more flexible and the waist belt more sticky. Give you a perfect fit.Waist Trimmer + Waist trainer. Our waist trainer cincher girdle with 7 steel bones which super compression on midsection & avoid roll up, but recover quickly to origin, flexible and durable. It provides the side and back support.