FUT Waist Tummy Trainer Belt Slimming Supportive Shapewear Tight Corset Material:90% POLYESTER And 10% SPANDEX Condition: Brand And High Quality, New With Tags,Low Price,Best Service BEFORE ORDERING: We are not standard USA size, don't use amazon size chart. Please Careful Reading Our Size Chart,Example #1: S Szie for Waist 24.5"-26.7" mean: "S size fit your Natural Waist 24.5-26.7inch".Please refer to picture for detailed information and allow a little inaccuracy due to hand measure. 4 Spiral steel bone, which is the fins material inside the corset. It's flexible and durable,can bend easily but recover quickly to origin. High elastic free support,helps with weight loss,reduces waist size,helps with posture Please refer to picture for detailed information and allow a little inaccuracy due to hand measure.