Dirt and dusty trails don't stand a chance against the Troy Lee Designs The Line D4 Polyacrylite Mips Mountain Bike Helmet that combines a durable Polyacrylite shell with the Mips® C2 rotational impact protection system to safeguard your head from multiple angles. High-flow air intake with side mesh keeps you cool, while the collarbone suspension system and quick-release 3D cheek pads maximize comfort and anatomical support. Anti-microbial padding fights odor to keep you fresh, delivering the protection, breathability, and confidence every serious rider needs.