evo.com | Troy Lee Designs Bike Helmets > Take a look around: the Troy Lee Designs D4 Composite MIPS Bike Helmet is on some of the most recognizable heads on the hill. From freestyle riders who launch themselves upside down on purpose to racers who pay their mortgages by going as fast as possible on a bike, the D4 is the choice of professionals in every genre. At 1050 grams, it's an ultra-lightweight full-face that's a joy to wear. There's nothing better. 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. Break-Away Anodized Aluminum Visor Screws Quick Release XT2 3D Cheek Pads Ventilation Large front and rear air passages coupled with deep internal channeling for maximum airflow and cooling efficiency. Certifications CPSC 1203, CE EN 1078, ASTM F1952-DH, ASTM 2032-BMX | Troy Lee Designs D4 Composite Bike Helmet 2023 - X-Large in Red | Aluminum