Open Box Hollis F-1Power without compromise. The Hollis fin blends graceful movement, power, and bulletproof construction. Meet the new standard in diving. Features High grade, heavy duty rubber construction Angled strap mounts for comfort and a better transition of power Spring heel straps with easy grip heel tab Multiple strap mounting positions for a fine tuned fit Vented blade to reduce stress while accelerating water over the blade Generous foot pocket