The string on the back is adjustable, please try to adjust it to be more fit for your body. This waist trainer corsets can be used for waist training, during gym workout, for providing lumbar and back support, for posture correction, and as a tool for weight loss and waist slimming. Product packaging:2 Pieces, including 1 Corset , and 1 Matched G Strings. Material:75%Polyester. Perfect for parties,cosplay,club, a night out, or a bedroom lingerie.