Specification ItemName : Sport Aid Suspensory MD 1 Each (Pack of 4) ItemPackageQuantity : 4 ItemTypeKeyword : back-braces PartNumber : PT101135-4 ProductDescription : Helps reduce pain and discomforts associated with injuries, accidents, arthritis and repetitive stressors to tendons and muscles. Or use as a preventive reminder. Affordable, long wearing, provide firm yet comfortable support, lightweight, go anywhere support. Provides firm support, comfortable, easy to adjust. Measure the pocket width: medium fits 4-4.5 inches (10.2-11.4 cm).