MASS21 Women's Workout Latex Sport Waist Trainer Corset Tummy Shapewear Girdle Material:Core:100% Latex,Lining:96% Cotton+4% Spandex 4 spiral felixboning supports,flexible and durable,bend easily but recover quickly to origin,With 3 Hooks for sizing you can adjust as you make progress with your training and ensure you maintain a snug fit at all times.High elastic latex. Can be used for yoga, postpartum belly abdomen corset etc. Outer layer constructed with latex to create thermal action that stimulates fat burning and removal of toxins. Lined with soft, gently cotton for maximum comfort. You Can Put On this Soft Shapewear for Sport Gym or Outside Run, it is Good for Body Shaper and Tummy Control Please don't use amazon size chart. please use our advice size chart,if you have any questions about size,pls feel free to contact us.