Giro Crue MIPS Helmet - Kids': The CrAoee(TM) MIPS delivers classic style and park-worthy performance for young shredders. It features MIPS, the Multi-Directional Impact Protection System (which can provide more protection in certain impacts), durable Hard-Shell Construction, ample venting, and our easy-to-use in form Fit System. Learn more at Giro.com/Crue. FEATURES Removable goggle retainer Compatible with aftermarket Giro audio systems by Outdoor Tech Seamless Compatibility with Giro Youth goggles (Rev and Chico) Compliance: CE EN1077 SIZES Youth XS: 48.5-52cm Youth S: 52-55.5cm Youth M: 55.5-59cm CONSTRUCTION MIPSA(R) - Multi-Directional Impact Protection System (optional) Hard-Shell Construction FIT SYSTEM In Form(TM)Fit System Vertical Tuning VENTILATION Stack Vent Super Cool(TM) vents