Details The Quantum helmet is protection with maximum horsepower. Aerocore™ construction featuring Koroyd® and Smith's innovative exoskeleton design are used to increase protection in key side-impact zones for the athletes pushing the limits of snow riding. The Wayfinder strap system featuring the Fidlock® buckle is functional simplicity, making it easy to use one hand for on and off use. For the most custom fit, the Quantum offers the BOA® FS360 fit system with a 360® halo design. Combine all this with the Smith-pioneered AirEvac™ technology for superior goggle integration, and the Quantum delivers maximum protection with the best fit and protection out there. Construction Hybrid shell construction Aerocore construction featuring Koroyd®: Smith's objective and design philosophy behind Aerocore™ construction is to increase airflow, improve temperature regulation resulting in fog-free vision and improve impact resistance. The objective was achieved through the combination of materials such as EPS and Koroyd®, a revolutionary new material that absorbs more energy upon impact when compared to international standards, while increasing airflow. Aerocore™ construction through the use of Koroyd® and EPS allows for more vents to be placed throughout the helmet without sacrificing protection and comfort. Exoskeleton zonal-impact protection Fit Adjustable Boa® FS360 fit system Ventilation 22 vents AirEvac™ ventilation Details Removable earpads Nanosilver performance lining Fidlock buckle Outdoor Tech™ audio systems available Lifetime Warranty Certification: ASTM F 2040, CE EN 1077:2007 CLASS B Helmet Size S = 51-55cm M = 55-59cm L = 59-63cm Weight 23oz/650g (Size M) Smith Quantum MIPS Helmet