Neptune Auto Inflatable PFD is designed for the boater who wants extra peace of mind. Auto-inflates when immersed or when the back-up jerk tab is pulled. Engineered for comfortable all-day wear with ergonomic collar and neoprene neck panel to prevent chafing. Mesh Yoke with daisy chain attachment points for clipping on gear. Zippered storage pocket. Easy to install bayonet CO2 cylinder and Indicator Window to check status. Includes whistle.