This is the ScubaPro Jet Sport Adjustable Scuba Diving FinsFeatures: Three-material blade construction optimizes flex to maximize kicking performance. Drag-reducing vents substantially decrease resistance on both up and down strokes. Big blade generates a powerful response in the water and improves stability and maneuverability. Ergonomic foot pocket molds to your foot for total comfort. Quick-release buckles simplify strap adjustment and make donning and doffing easy. Effective non-skid pattern protects against slips on wet surfaces. Small sizing is ideal for smaller feet. If you're a fan of traditional blade fins, the JET SPORT ADJUSTABLE will definitely impress with its power, acceleration and maneuverability. Lightweight and comfortable, with a big, slightly stiff blade and a soft rubber foot pocket, this fin generates propulsive kicking power, provides good stability and makes efficient work of frog and dolphin kicks. The fin is easy to maneuver too; responsive in turns and able to back you out of tight spots with ease. The rubber foot pocket molds comfortably to your foot, and the strap adjustments and quick-release buckles make donning and doffing the JET SPORT ADJUSTABLE oh-so-easy. "