The Air Master was designed to perfect the delicate balance between aerodynamics and ventilation. It's for this reason that it is the helmet of choice in the Astana Pro Team.Usually when you make a helmet this aerodynamic, you would have to compromise on ventilation, but Limar have found a way around this by exploiting the Venturi effect into the Air Master and all their other Air Revolution helmets. The Venturi effect occurs naturally when air enters a wide area and is pushed out through a smaller area which then accelerates air flow. Its this accelerated air flow, aided by channels inside the helmet's shell which adds to the comfort of the Air Master. Heat is quickly expelled, keeping your head cool.The Air Revolution range of helmets was designed in close collaboration with the Astana Pro Cycling Team with the idea to create a range of aero helmets that are all based around fully functioning aerodynamics. This has resulted in a helmet that has a sleek racing profile and amazing aerodynamics required on for Grand Tour racing and would also be ventilated and comfortable enough wear on every ride from early spring to the height of summer.**Developed in the Wind Tunnel**You can count on Limar's over thirty years of experience in producing and manufacturing advanced helmets to give you a product that is truly technologically advanced. Thanks to ongoing tests in the wind tunnel in Magny-Cours in France, Limar have worked on every single detail, to reach the best possible balance between aerodynamic and ventilation. The result being The Air Master, a helmet with such a combination of performance and comfort like you have never seen before.* Technology: In-mould triple shell* Air Vents: 15 air vents, inner air flow channels* Sizing System: AirFit-System with height adjustment and webbing connection* Pads: Antibacterial and washable comfort pads* Fit: Pro* Size: M: 53-57cm / L: 57-61cm* Weight: M: 240g / L: 260g