Finis Foil MonofinnSingle Blade Design: Promotes Development of Undulating Foil Body Motion Propulsive Dolphin KicnTechnique Channels: Controls Flex of Fin and Encourages Correct Foil MovementnZoomers Technology Design Principles and MaterialsnSingle blade design promotes development of the undulating foil body motion and propulsive dolphin kick Technique channels control the flex of the fin and encourages correct foil movement Works core and leg muscles more than standard fins Men's sizes: (XS) 3-5, (SM) 5.5-8, (MD) 8.5-10, (LG) 10.5-13, (XL) 13.5-15