Aqualogix All Purpose Hybrid Resistance Fins - Smoke (5" Blades) - The All Purpose Hybrid Fin is the newest addition to our line of functional aquatic resistance equipment.  The All Purpose Fins provide a great balance of good resistance for knee hinge movements and also long lever hip articulation. You achieve results with high speed water exercises, dynamic neuro-muscular training, athletic performance training, resistance swim training, rehabilitation and injury recovery pool training.