This occurs naturally when air enters a wide area and is pushed out through a smaller area, which then accelerates air flow. Heat is quickly expelled, keeping your head cool. The Air Star is a true all-rounder In the Air Revolution range. The included rear red light increases safety when riding at night or in limited light conditions and fits perfectly on the helmets adjustment system. While being an ideal choice for commuters, its aerodynamic design and striking looks make it a popular choice with road, gravel, cyclocross and MTB riders alike. With 19 vents and internal channels throughout the helmet, the air circulation in the Air Star is boosted by the 'Venturi' effect. This 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 Star. Heat is quickly expelled, keeping your head cool. The exclusive adjustment system on the Air Star; 'Competition +' allows both horizontal and vertical adjustment, and guides the straps for perfect fit. Our Story: Our story begins in 1919 when William Chicken first imported steel tubing from Europe to build bicycle frames. On very rare occasions items can become damaged in transit.