Enhanced With Dura-Matter Construction, Mod1 Pro Sl Is Designed To Increase All-Around Durability While Keeping The Same Lightweight, Low-Profile Design As Mod1. This Classic Skate-Style Inspired Helmet Is Offered In Multiple Fits And Caters To Skiers With A Removable Chin Guard. Features:- Chin Guard: Designed To Provide An Extra Layer Of Safety To Help Protect The Racer’S Face.- Dura-Matter: Our Most Robust Construction Method, Using An Injected Molded Dura-Matter Shell Applied Over An Eps Foam Liner. Dura-Matter Is Dent And Ding Resistant, Offering The Highest Level Of Durability.- Skull Matrix: Mips® And Boa® Technologies Merge Into A Unique Single System. Skull Matrix Is Designed To Provide A More Adaptive Fit To Help Enhance Comfort For An Improved Riding Experience.- Ventilation: Fixed Vents In Front Of Helmet Allow For Goggle Ventilation While The Fixed Vents On Top Of The Helmet Help Keep The Riders Cool. - Removable Liner And Earpads: Detachable Headliner And Earpads Offer The Freedom To Adjust The Configuration To Your Liking, And Machine Washable For Easy Cleaning.- Mips® Brain Protection System: Reduces Rotational Forces Caused By Angled Impacts To The Head.- Boa® 360 Fit System: A Fully Adjustable Design Is Engineered To Help Deliver An Exact Fit.- Fidlock® Buckle: Seamless Magnetic Functionality Lets You Fasten Your Helmet With Gloves On.