The Zen Keel is the largest fin by area in our SUP Line, measuring in at 70 sq. inches. Derived from the Flatwater Keel, this large fin is aimed at increasing stability while paddling. The Zen Keel is an excellent choice for SUP Yoga, SUP Fitness and SUP Pilates. The large area reduces side to side board roll, allowing for ease in moving through poses or exercises. Bamboo layered with a Honeycomb core makes this fin lightweight and suitable for any level of paddler.