Ideal balance of thermodynamic and aerodynamic properties.Wind tunnel tested.Airflow Cooling System (ACS).Unobtrusive strap anchorage.Double In-mold construction.High density EPS foam.5 Ventilation holes.Adjustable straps with easy handling for a perfect and comfortable fit on the head.Clamping system with easy adjustment of the Omega height and circumference.Internal lining design optimised for airflow.QuickDry lining with silver particles for antibacterial properties.Sizes: M (55-58 cm) and L (58-62 cm).