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.