This is the Sherwood Triton With New Bungee Strap Open Heel Fins Features: Scuba Labs Choice for Power & Acceleration Lightweight Thermoplastic Polyurethane (TPU) Great Travel Fin Looks Old School", But Derived from Years of Research 3-Vents Between Foot Pocket and Blade Vents: Adds Thrust on Down Kick & Decrease Drag on Up Kick Foot Pocket Shape & Size: Satisfy Most Exciting Requirements for Comfort & Power Positive Buoyant, Floats Open Heel Design Adjustable Straps with Quick-Release Buckles "Squeeze-Style" Side-Release Designed Buckles Large Heel Pull Tab Strap & Pull Tab: Provide Easy Donning and Doffing Blades Ribbed Design: Focuses Water Down Length of Blade Ribs: Increased Power and Thrust Looks old school", but the all new Triton by Sherwood is a new fin with three vents between the foot pocket and blade that provide additional thrust on the down kick and decrease drag on the up kick or recovery. Foot pocket shape and size derived from years of research to satisfy the most exciting requirements for comfort and power. The Triton Fin is positively buoyant and floats if they come off. This open heel fin has adjustable straps with quick-release buckles and a large heel pull tab that combined for easy donning and doffing. The fin blades ribbed design focuses the water down the length of the blade for increased power and thrust. The Sherwood Triton Fins are made from a lightweight, durable Thermoplastic Polyurethane (TPU) material.