The AIR PUMP SYSTEM now available in the FS-15 AIR SNARL provides a comfortable custom fit by forcing air into the cheek pads through a form fitting air chamber. One button when pumped inflates the cheek pads to adjust to your comfort level. A Built-in Chin Valve allows air to move in both directions eliminating unwanted pressure. The Air Pump System dramatically reduces helmet noise by tightening the neck curtain. One button releases air on both sides of the cheek pads for quick and easy removal. The entire system is easy to remove & install.