Oceanic Vortex V-16 Split Fins for Scuba and Snorkeling - Regular - Neon Yellow New! All fins now come with Spring Heel Strap for Streamlined Comfort & Easy-On, Easy-Off! Patented Nature's Wing - Propeller Fin Technology with four (4) material compounds for ultimate performance and light weight Semi-rigid battens and natural rubber flex channels precisely control the shape of the blade during the fin stroke to optimize power and reduce drag Oversized side rails add rigidity and control movement of the blades for increased lift, power and efficiency Ergonomically designed foot pocket accommodates virtually all foot sizes and boot styles