The Highwire is fast becoming a classic with its discrete peak styling. The tough wearing endura shell construction is well suited for those venturing into the park. Passive ventilation helps maintain airflow and Anon’s expedition fleece lined ear pads will keep you warm when needed. The Auto-adjust sizing system makes for a snug fit.Size GuideSmallMediumLargeX-Large52-55cm56-59cm60-62cm63-64cmClick here for more information on our Size & Fit GuideVenting: PassiveSizing System: Auto-adjustWeight: 545gConstruction: Hard ShellSafety standard: eN 1077 Class B, ASTM F 2040 VentingPassive ventilation channels integrated into the helmet draw fresh air in the front and pulls moisture out the back. These built-in channels aid in maintaining a balanced and comfortable climate all day long.Anon’s goggle ventilation channel helps maintain airflow to goggles to help reduce fogging.Sizing SystemAuto-adjust fit system features an elastic closure in the rear of the helmet that dynamically flexes around the wearer\'s head for a perfect fit.Constructionendura shell construction features an injection-moulded ABS exterior for long-lasting durability and ding-resistant strength. Built for season after season of knock-around wear and tear.