With its comfortable fit of 100% natural rubber, the Z2 creates a soft and secure fit and inhibits hyper flexion. With its short blade, Z2 Gold Zoomers® encourages shorter and faster kicks while experiencing just enough propulsion through the water. The Z2 efficiently propels you forward. The fluid separator located on top of the fin, allows your foot to easily slice through the water while reducing fatigue on the down kick and quads. Whereas the flex box, located on the bottom of the fin, helps you catch the water on your up kick, targeting and strengthening your hamstrings and glutes.