The Atomic Open Heel HEC SplitFin with Spring Straps Medium Aqua is a premium open-heel scuba diving fin built for divers who want efficient propulsion, reduced drag, and less fatigue on long dives. Atomic says the fin uses a High Energy Compound (HEC) that is slightly positively buoyant in both fresh and salt water, helping reduce the heavy, sinking feel that can add strain to your kick cycle.

The split blade design channels water efficiently to create strong forward thrust with less effort, making this fin a strong choice for divers who want speed, comfort, and control. Atomic says the HEC SplitFin delivers high thrust with low frequency kick cycles, making it ideal for long dives and stronger current conditions. The design also includes power rails, flex battens, and flexible hinge points to help optimize blade shape, improve energy transfer, and reduce drag through the water.

This version also includes the Atomic Aquatics Spring Strap Assembly, which Atomic says provides a secure, adaptive fit and makes donning and doffing easier. The streamlined strap profile helps reduce unnecessary drag, while the open-heel design pairs well with dive boots for comfort and versatility. Atomic also highlights the EZ-LOK buckle system and anatomically contoured foot pocket for easier handling and a more comfortable fit.

For divers shopping for a high-end split fin, open-heel dive fin, or a comfortable fin for long scuba dives, the Atomic Open Heel HEC SplitFin with Spring Straps Medium Aqua is an excellent choice. It combines buoyancy-conscious materials, efficient propulsion, and proven Atomic fin technology in a clean Aqua color option.