Overview The Aqua Lung Express Open Heel Fins are performance-oriented scuba diving fins engineered to deliver comfort, power, and efficiency with every kick. Featuring Aqua Lung's innovative Armadillo propulsion system, these fins store and release energy throughout the kick cycle to help maximize thrust while reducing fatigue. Combined with spring straps and a comfortable foot pocket design, the Express SS is built for divers seeking dependable performance in a wide range of diving conditions. Best For Recreational scuba diving Divers seeking efficient propulsion with reduced leg fatigue Use with dive boots in warm, temperate, and cold water environments Not Ideal For Travelers prioritizing ultra-lightweight packing Divers seeking a highly rigid technical diving fin Key Features Armadillo Propulsion System: Ultra-elastic rubber membrane stores and releases energy throughout the kick cycle for enhanced propulsion Mid-Foot Flex Joint: Connects the blade farther back on the foot pocket to help reduce strain on ankles and toes Efficient Energy Transfer: Variable-thickness foot pocket securely connects the foot to the blade for improved kicking efficiency Water Channeling Side Ribs: Rubber side rails help direct water along the blade while reducing spill-over Spring Heel Straps: Stainless spring straps with soft TPR heel pads provide easy donning and a secure fit Enhanced Grip: Oversized anti-slip rubber pads improve footing on wet surfaces Specifications Fin Style: Open heel Strap Type: Spring heel strap Propulsion System: Armadillo elastic membrane technology Foot Pocket: Ergonomic multi-density design Blade Design: Mid-Foot Flex Joint with water-channeling side ribs Fit & Sizing The open-heel design is intended for use with dive boots. The spring strap system automatically adjusts for a secure fit while making the fins easy to put on and remove, even when wearing gloves. How the Armadillo System Works The Express fin uses the same propulsion principles developed for Aqua Lung's Slingshot and Hotshot fin designs. The patented Armadillo membrane stretches during the downstroke to store elastic energy, then releases that energy during the kick cycle to help improve propulsion efficiency. It also bridges the gap between the foot pocket and blade, preventing water loss through the center of the fin. Use Cases Recreational scuba diving Boat and shore diving Warm, temperate, and cold water diving with boots Divers seeking efficient propulsion with reduced effort Expert Insight The Express SS stands out because it combines comfort-focused ergonomics with an energy-return propulsion system. The Armadillo membrane helps create a smooth and efficient kick cycle, while the spring straps and comfortable foot pocket make these fins easy to use for divers of all experience levels. What’s Included Pair of Aqua Lung Express SS Open Heel Fins Pre-installed spring heel straps Not Included Dive boots Fin bag FAQs What is the Armadillo propulsion system?It is an elastic membrane that stores energy during the kick cycle and releases it to help improve propulsion efficiency. Are these open heel fins?Yes, they are open heel fins designed to be worn with dive boots. Do the fins include spring straps?Yes, the Express SS comes equipped with spring heel straps and soft TPR heel pads. What does the Mid-Foot Flex Joint do?It helps reduce stress on the ankles and toes while improving comfort and power transfer during kicking. Care & Return Policy Rinse thoroughly with fresh water after each dive and allow the fins to dry completely before storage. Regularly inspect straps, springs, and foot pockets for wear or damage. For full details on returns and eligibility, please review our Return Policy .
