1Extender 3 hooks, three distance adjustment, can be adjusted according to the size of the chest. 2Transfer and gathering the supernumerary breast, help shoulders back and stomach in, thin and breathable. 3Open shoulders, improve chest sagging, and correct bad posture, good correction effect. 4Correction of spinal curvature, correct and straighten the back, and present a perfect curve. 5There are 4 different sizes available, you can choose according to your demands.