The flagship helmet of Smith's mountain bike collection is the completely new, downhill-certified Mainline. With its extensive Koroyd coverage and MIPS rotational system, the Mainline offers exceptionally high protection while combining internal air channels with open exhausts to maximize breathability. Since fit and ventilation are crucial for long days, the AirEvac system directs the warm air that collects on your goggles away to prevent fogging. The Mainline comes with three sets of cheek pads, two sets of upper liners, and two neck rolls, all in one size, ensuring the perfect fit. All components can be easily removed for cleaning. With the knowledge that the Mainline is secured with a proven and reliable double-D buckle, you can pedal with confidence.