The helmet that inspires the will for more. Whether on the morning commute or out for a weekend ride, the Omne Air SPIN pushes you to go further. Optimal liner density and thicker core protection zones provide ideal all-round protection for everyday use, while ventilation channels and a low weight inspired by our award-winning road cycling helmets the Octal and the Ventral deliver optimum comfort and functionality on longer rides. By taking their whole-helmet approach to the creation of the Omne Air SPIN, the helmet delivers superior levels of comfort, fit and performance. SPIN (Shearing Pad INside), their patent-pending silicone pad technology, also features. Technologies SPIN (Shearing Pad INside) - their patent-pending silicone pad technology system. A silicone gel-like membrane inside the helmet padding forms the basis of our patent-pending SPIN technology Integrated Sunglasses Storage - It's easy to keep your sunglasses on the helmet mide-ride, as storage is built in to the helmet. Features Optimised-density EPS liner offers ideal impact force absorption Slim profile for low weight and a clean aesthetic Lightweight size adjustment system makes it easy to find the perfect fit Easily adjustable straps with anchors molded into the helmet liner improve both comfort and safety 3600 size adjustment system makes it easy to find the perfect fit Size Guide SizeSmallMediumLargeHead Circumference50-56cm54-59cm56-61cmHelmet sizes are based on the circumference of your head. To determine the correct size, wrap a measuring tape around your head. Once you've determined the measurement, you can use the chart here as a guide.