Troy Lee Designs D4 Composite With Mips Qualifier Bicycle Helmets D4 reigns king atop downhill podiums and freeride events across the globe. Available in carbon and composite, details are what makes the D4 the most coveted full-face in mountain biking. Prioritizing safety while balancing weight through premium construction and materials, D4 incorporates MIPS protection with an EPP chin bar and anatomical cheek pads with emergency release.​​ Superior Protection with Mips Technology The Troy Lee Designs D4 Composite With Mips Qualifier Bicycle Helmets feature cutting-edge Mips (Multi-Directional Impact Protection System) technology. This innovative system reduces rotational forces during impacts, providing added protection for your brain in the event of a crash. With the D4 Composite helmet, you can ride with confidence, knowing that you're equipped with the latest in helmet safety technology. Lightweight and Durable Design Crafted from high-quality composite materials, the Troy Lee Designs D4 helmet strikes the perfect balance between strength and weight. The lightweight construction ensures maximum comfort during long rides, while the durable design offers exceptional impact resistance for enhanced safety on the trails. Optimal Ventilation for Enhanced Comfort Stay cool and comfortable on even the hottest days with the D4 Composite helmet's advanced ventilation system. Strategically placed vents allow for optimal airflow, helping to regulate temperature and prevent overheating during intense rides. Sleek and Stylish Design Not only does the Troy Lee Designs D4 helmet offer unbeatable protection and performance, but it also boasts a sleek and stylish design. Available in a variety of colors and graphics, you can choose the helmet that best reflects your personal style and preferences.