aids treatment of back problems such as poor posture, backaches, neck and shoulder pain, curvature of the spine (Scoliosis), Osteoporosis, mild to moderate Kyphosis, slumped shoulders, indigestion and erratic bowl. Posture Correction and Round shoulder Clavicle Fracture and AC joint Support;Offload Neurological symptom from Brachial Plexus area Support Thoracic spine and CT junction;Front closure design for easy application. Neoprene Elastic and velcro material combined with strap padding and soft back padding provide a comfortable fit;separate thoracic pad zone to direct pressure in this area of support, prevents deformation of spinal column and eases human body fatigue;What size do I need: SIZING GUIDE - Measure chest circumference Size Cm inches Small 80 cm Medium 85 cm Large 90cm X-Large 100 cm XX-Large 110cmProvectus