Aqualogix Low Resistance Hybrid Fins - Green (4" Blades) - The Low Resistance Hybrid Fin (also known as the High Speed Fin) is the newest addition to our line of functional aquatic resistance equipment. Green Low Resistance Fins are great for quick tempo cardio or sports specific movement training. Help promote development of fast twitch muscle fibers. They are also a good starting point for those recovering from Knee or Hip injury. Also a great tool for combining resistance and drag to your swim training.