Sizing Guide Measurements taken from chest circumference: X-Small - 18" - 24" Small - 24" - 30" Medium - 30" - 36" Large - 36" - 42" X-Large - 42" - 48" XX-Large - 48" - 54" 3X-Large - 54" - 60" Corflex Elastic Shoulder Immobilizer, 3X-Large info: We aim to show ...