Fourth Element Tech FinsFourth Element Tech Fins A redesigned classic vented fin for maximum performance. Made with a unique density gradient natural rubber, it offers a comfortable foot pocket and optimized stiffness for efficient finning. The vented design reduces drag and fatigue by allowing water to flow along the blade. Stiffening rails and ribs ensure the fin blade powers through the water for maximum efficiency. Tech Fins were developed with technical divers in mind,