Back Protection Figure 8 Clavicle Brace & Therapy Correct Posture Chest - Shoulder Support (Medium) HUGS YOUR CHEST with SIMPLE SIZING - Measure under your armpits and go around your chest (circumference). MEDIUM fits chest size: 31-38 inches. LARGE fits chest size 38-43.5 inches. If it feels uncomfortable, that's to be expected as it's keeping correct alignment STOP HUNCHED BACK - Others might have slimmer designs but not near as effective. It's THICK for a reason! Padded and cushy for your comfort as it guides you to corrective alignment. Stop that hunched over look...Our design works! SATISFACTION GUARANTEED WEAR PRE & POST OPERATIVE - The unique design keeps the arms back so that there isn't more damage to the collar bone. Let it work for your computer hunched body or for sports injuries SIMPLE TO PUT ON! - Tuck the ends of the harness through the O ring and secure with the velcro on the outide. It takes seconds to set it up and then slip your arms through the comfortable harness and heavy duty velcro holds our harness in place COLLAR BONE PROTECTION - Benefit from keep injuries at bay with our deluxe reinforcement. Helps keep corrective and positioning in a healing hold. GET NOW WHILE SUPPLIES LAST