The S11875 features a 2-in/5 cm waist belt that fits up to a 44-in/1.1 m waist, padded for comfort and connected to 20 feet/6 m of latex with safety cord tubing and sliding attachment that moves freely around the belt for unrestricted movement. Used in either 25yd or 25m pools. Interchangeable. Choose from 4 resistance levels. It provides swim out and pull-back resistance to improve strength and stamina.Accelerate quicker, strengthen the finishes of each stroke and improve your times.A proprietary, embedded safety cord runs the full length of the tubing and acts as a limiter to help prevent over-stretching.