evo.com | Troy Lee Designs Bike Helmets > At only 1000 grams, the Troy Lee Designs D4 Carbon MIPS Bike Helmet is a featherweight dream. It barely registers as any extra weight on your head, remarkable when you consider its superior protection. Whether you're a BMX racer obsessing over grams or a jeans-wearing park rat who wears a helmet all weekend, you'll appreciate the protection-to-mass ratio of the D4. Not to mention how sick this thing looks! Plush Helmet Bag Included Ventilation Deep air passages for direct air flow. MIPS (Multi-Directional Impact Protection System) MIPS stands for Multi-directional Impact Protection System. It is a revolutionary technology that lets the helmet slide relative to the head, adding more protection against rotational violence to the brain caused by angled impacts. Quick Release XT2 3D Cheek Pads TeXtreme(R) Spread Tow Carbon Fiber Shell | Troy Lee Designs D4 MIPS Bike Helmet 2024 - Medium in Yellow