ForceFins Beaver: Designed from observing beavers, especially their flexible tails This newest snorkeling fin holds the surface well and is easy to kick Included accessories: Adjustable Foot Pocket with integrated Comfort Instep™, Bungie Heel Strap, Vortex Generators, Force Fin brand adjustment tool Also available without accessories (@ $129.95 / pair) Adaptable for Force Wings for variable thrust