Constructed using Schuberth's proprietary methods, the shell is made with the extremely light S.T.R.O.N.G. fiber, a special fiberglass-reinforced duroplastic matrix. The smallest of the three shell sizes weighs in at about 1,350 grams (< 3 lbs). Schuberth's patented Anti-Roll-Off System offers additional protection to the infinitely adjustable D-Ring closure. The removable, washable Coolmax® liner has a hypoallergenic, antibacterial, odor-reducing treatment providing all-temperature comfort.