Phantom Aquatics Air-Ease Swimmer's Snorkel Center-mount Design: Relax in the water in order to focus on stroke and improve technique One-way Purge Valve: Allows for clear and easy breathing Hydrodynamic Design: Worn with swim goggles, promotes proper head and body position Front Positioning: Swim at slower speeds with perfect stability All Four Swim Strokes: Stays in place for all competitive strokes, including flip turns