It's important to have the right training gear that will help you to maximize your workout. Aqua Sphere's innovative range of swim training and water exercise products are designed to enhance training and address the shortcoming of traditional training products. The Zip VX Swim Fins are designed to give you a heart smart cardio workout as well as improve your core strength. They feature an easy to adjust comfortable back strap that makes taking the fins on and off a breeze. The design of the narrow fin prevents fatigue, primarily in the ankles and allows you to work out for longer durations of time.