Adult Dual Visor Modular Snowmobile DOT Full Face Flip-up Helmet (Matte Black, Large) Retractable tinted sun visor Smooth opening and closing with easy to actuate button Double Pane shield with anti-fog coating Adjustable breathbox and chin skirt included SIZE CHART (Circumference of the largest part of your head, usually just above the eyebrows) in inches SMALL: 21  to 22 - MEDIUM: 22 to 22  - LARGE: 22  to 23 - XL: 23 to 23  - XXL: 23  to 24. Head shapes can affect how a helmet fits. The size chart is meant to be a starting point. Typhoon Helmets allows exchanges for a different size or color. Just return your purchase to us at your expense and we'll send your exchange at no charge to you. Dual pane Anti-scratch coating Clear impact resistant polycarbonate Upper and lower dual air intakes Interior airflow channeling system Suitable for all seasons riding Reduce condensation and fogging at lower temperatures Deflects breath out the bottom of the helmet Easy installation and removal Breathable padded liner Removable, washable Padded chin strap Quickly engage without taking gloves off Fully retracts and locks into place Fits over prescription glasses Retractable design Keep warm without needing to take helmet fully off Smooth open/close