Vulcan Premium Multi Sport White/Silver Matte Bicycle Helmet - Small/Medium Polycarbonate (PC) micro-shell / EPS in-mold construction (most entry level helmets are shell glued to EPS) Helmet complies with all U.S. CPSC bicycle safety standards Nexus quick release buckle (Nexus is a recognized leader in bicycle buckles) 20 flow-thru molded air channels, (entry level helmets have 12 to 14) Lightweight, comfortable webbing