The patented, streamlined arena Training Tool Swim Keel is pullbuoy and kickboard all in one. It has multiple functions. It helps training butterfly or backstroke leg kick and can be used as stable pullbuoy. Advanced swimmers can use it also as instable pullbuoy for improving the stability of the hip. The innovative tool is perfectly tared, for an excellent position in the water. The swimmer is positioned with the hands just below the water surface, what enables to train in the best position. PVC free.  
Outside: 100% Ethylene Vinyl Acetate; Inside: 70% Iron alloy 30% Polyethylene