The Mares Avanti QUATTRO 4X is the next-generation open-heel fin, combining comfort, power, and control. With a three-material blade, optimized foot pocket, and 4-channel thrust system, it delivers efficient propulsion and all-day comfort. Features include stabilizing ribs, bungee strap, anatomical heel pad, and a reusable mesh bag. Available in sizes XS to XL. Designed for all dive styles.