A Lightweight And Low-Profile Design Inspired By The Classic Skate-Style Helmet. The Mod1 Is Available In Three Fits (Standard, Asian, And Youth) And Delivers Simplicity With Premium Functionality For Wherever Your On-Mountain Adventures Take You.Features:- Boa® 360 Fit System: A Fully Adjustable Design Is Engineered To Help Deliver An Exact Fit.- Fixed Ventilation: Allows Hot Air To Escape From The Top Of The Helmet.- Mips® Integration (Optional): The Mips® Brain Protection System Is A Helmet Integrated, Low Friction Layer Designed To Reduce Rotational Motion Transferred To The Brain During An Impact.- Fidlock® Buckle: Seamless Magnetic Functionality Lets You Fasten Your Helmet With Gloves On.- Removable Liner/Earpads: Allows For Easy Cleaning As It Is Machine Washable, Adaptable For Various Weather Conditions, And Provides Freedom To Wear The Goggle Strap Underneath The Helmet.- Brim/Goggle Ventilation: Allows Hot Air To Flow Unobstructed From The Goggle Through The Brim Ventilation For Better Anti-Fog Performance.- Adult: Small (51-55cm) / Medium (55-59cm) / Large (59-63cm) / Extra Large (61-65cm)- Astm F2040 And Ce