Oceanic Viper Fins combine ergonomics, hydrodynamics, and materials technology for the ultimate in comfort, efficiency, and performance. The Viper blade's flexible center area creates a massive water channel by utilizing the entire surface area of the blade and foot pocket. The engineered channels and side rails direct water flow off the tips of the fin without allowing water to "spill" from the sides of the blade and reduce power and efficiency. Flexible center channel accelerates water over the blade for improved efficiency. Vents reduce stress while accelerating water over the blade. Oversized blade produces increased thrust. Generous but streamlined foot pocket fits any type of boot without creating more drag. Easy adjust quick-release buckles. Easy on/off thumb loop. The Oceanic Viper fins are lightweight powerful and economical in a great looking package what more could you ask for.