Bell Star Infusion (Top Air) helmet uses Bell's Air Chamber technology to create pressurized chambers inside the helmet to help accelerate and route airflow for maximum ventilation. The Star Infusion Top Air features a low profile top air chamber and a new pipe location that is farther back and at a lower angle for better clearance. The Star Infusion can also be outfitted with Bell's Side Air adapter nozzle where side air applications are preferrable. The Top Air model accelerates airflow around the top of the head and to the cheek area of the face. The STar Infusion is used extensively in NASCAR and Sports Car competition. Constructed with a Light-Weave Composite Shell, E-Max Plus energy system, comfortable Complex/Carbon X lining, and large eye port size. SAH2010 certified. Pre-drilled for HANS posts. Available in white or matt black. Sizes: 7-1/8 to 7 3/4.