The Smith Sports Optics Engage MIPS Mountain Bike Helmet delivers protection and comfort for cycling adventures. This Smith mountain bike helmet features a lightweight in-mold construction with a MIPS liner that reduces your brain's rotational motion during impact. An extended back maximizes protection, while a VaporFit adjustable system offers 270 adjustment with the turn of a dial for the perfect fit. 21 built-in vents keep you cool on warm-weather rides, and a padded lining prevents chafing. AirEvac Ventilation system pushes warm air away from your sunglasses to reduce fogging, while a 2-position visor rotates for use with goggles. The Smith Sports Optics Engage MIPS Mountain Bike Helmet delivers style, comfort, and protection you can ride in with confidence. CPSC and CE EN 1078 certifications. Weight: 12 oz. MIPS liner maximizes concussion protection Lightweight, in-mold construction 21 vents allow cool airflow AirEvac Ventilation reduces fogging on sunglasses Built-in, adjustable visor is goggle friendly VaporFit dial-adjustment system Padded lining