The Mares Manta fin is a full foot fin with channels and vents, with a soft rubber foot pocket for comfort. As with all Mares fins, they feature an extremely soft rubber foot pocket that helps keep you comfortable in the water. The dual material construction allows the fin to flex on the outer edge of the blade, catching large "scoops" of water to aid in propulsion. In addition to this water scooping action, the Manta fin has two vents near the top of the blade. These vents allow some water to spill through, preventing fin wobble during the kick stroke.