This is the Atomic Blade Open Heel Adjustable Scuba Diving Fins Features: 2-Fame Designs on One-Fin to Maximize Kicking Power in the Water POWER-LOOP MONOCOQUE STRUCTURAL ENGINEERING MONOCOQUE and POWER RAILS Power-Loop Monocoque: Engineering-Term , Single Shell Heavily Utilized for Aircraft Fuselage or Indy Race Car Power-Loop Monocoque: Utilizes External Skin to Support Some-or-Most of Fins Load-Area POWER-LOOP MONOCOQUE FOOT POCKET POWER PLATE Power-Loop Monocoque Structure Located Over-the-Top of Foot-Pocket Connected to Fin via Frame Rail (or Backbone/Bulkhead) Sole Plate (Power Plate), Very-Solid-Feeling, Like being Bolted" to the Foot Power is Smoothly-Transferred without Twisting POWER RAIL Frame Rail Structure-on-Each-Side of the Fin Mimic a Bulkhead, Backbone or Spine VERTICAL STABILIZERS Oversized Vertical Stabilizers at Tips of Blade Keep Fin Tracking Straight Up-and-Down THE FOUR C'S OF ATOMIC THRUSTER FIN POWER: CAPTURE CONTAIN CHANNEL CONTROL Thruster Fins Capture Water Contain the Flow without Spilling it Over-the-Edges Channeling the Flow of Water Down-the-Blade and Off-the-Vertical Stabilizer Edge Tips Controlling Power with Atomics' 2-Frame Structures (Monocoque and Frame Rail) to Fully Optimize the Paddle Fin Design Non-Vented Blade Fins NEW BUCKLE STYLING Wicked" Design and Cleaner Styling EZ-LOK Squeeze-Style" Quick-Release Buckles Rubber Fin Straps with Large Pull-Tab for Easy Donning and Doffing Atomic Aquatics Blade Fins Capture water and Contain the flow without spilling it over the edges while Channeling the flow of water down the blade and off the vertical stabilizer edge tips, and Controlling the power with two frame structures (Monocoque and Frame Rail) to fully optimize the paddle fin design and kicking effort. "