The S109 is designed for long swim resistance training. The Drag Belt/Tow Tether increases endurance and strength in all swimmers. Varying chute sizes provide an endless combination of resistance levels and are compatible with flip turns. It is also designed for endurance swim training, resisted water walking, running and lunging. Ideal for group water fitness classes for high intensity training, for triathlete training and for rehabilitation in-water. The unique design of the S109 comes with an adjustable 44in/1.1m waist belt, 6.5ft/1.9m nylon Tow Tether plus one chute to provide in-water resistance. Tow Tether can accommodate multiple chutes simultaneously to achieve demanding resistance levels. Interchangeable. Available in four sizes.