Made from injected thermoplastic resin, the Zox Roadster DDV comes in 2 shell sizes to ensure a great fit for all riders. Weighing in at a measly 2 pounds the Roadster DDV significantly reduces wind buffeting and is great for cruiser riders who don't ride with a windshield. The revolutionary EPS liner from Zox has a narrower profile contribute to the reduced buffeting.; 2 Shell sizes to ensure good fit. Small size used for sizing 2XS-M, Large shell for sizes L-2XL Revolutionary Half Helmets EPS liner system for narrower profile shell Push pull retractable high definition shield system