Improve your flexibility with RockBand Flex's uniquely positioned loops that allow you to progressively increase your range of motion, stretch muscles and distract joints. Don't let post-injury rehab be a chore. With RockBand Flex, a world of exercises to retrain movement patterns and build strength are accessible anytime, anywhere. Product Features All-in-one rehabilitation, stretch and mobility solution Made of a machine washable cotton/nylon blend Includes a detailed instruction booklet for various workouts and exercises Choose your resistance: Light (Grey) is 12-18lb Medium (Black) 18-22 lb Heavy (Red) 22-28lb