Refer to Size Chart in Images and product description :
This comfortable posture brace is the most cost effective way to prevent slouching and long term pain that's associated with it. With straighter posture during all of your daily activities spinal pressure on your discs is relieved, reducing pain and in some cases inflammation due to bad posture. Formation of correct posture of kids and adults; indicated for kyphosis, lordosis, kyphoscoliosis, winged scapula. Rehabilitation after injuries and surgery of the thoracic and upper lumbar sections of spine and clavicle.

Unisex design for man and woman ,Fully adjustable .Really improve posture - gain confidence. Realigns your spine & reduces back pain. Easy to put on & strong yet comfortable. Injury rehabilitation. Risk-free purchase . Stand tall & confident .Relieve your upper back pain fast .Quick & easy to use . Treat your neck & shoulder pain now .

Features:
(1) the use of comfortable, breathable cotton material, buckles, made of adhesive tape.
(2) Special-eight open design is easy to adjust the tightness.
(3) easy to wear, comfortable, good air permeability.
(4) effective to medial fractures.
How to use: Pull shoulder straps over shoulders making sure that the elastic cloth are closest to your body. Stretch waist belt around torso and fasten. Adjust position and snugness as needed. Shoulder straps should pull back slightly on shoulder area. If needed pull waist belt down slightly to increase shoulder pressure.