Atomic Aquatics Blade Fin Power-Loop Monocque Structure - The engineering Term Monocque means "single-shell" utilizing the external skin to support most of the load area while power is applied through the frame rails. Foot Pocket Power Plate - The Power-Loop Monocque structure is connected to the sole plate (Power Plate) giving divers a solid feeling like the fin is "bolted" to the foot. Power Rail - The frame rail design on each side of the fin mimics a backbone or spine connecting to the Monocque. Vertical Stabilizers - Oversized stabilizers at fin tips keep the fin tracking straight up and down. EZ-LOK Buckle System