The Arena Vortex Evolution Hand paddles are made from polyproplyene, TPR, and silicone. This swim hand paddle features hydrodynamic shape, rubber contour, asymetric shape, entry and exit holes. Plus the tubular strap system allows for multiple positions for the straps. Designed for power swim training while reducing shoulder strain. This swim paddle also creates a good feeling of the water during use. Create a custom fit with the micro adjustments in the strap system.