Giro Tyrant Spherical Bicycle Helmets While the style is understated, the Tyrant boasts countless under-the-hood tech breakthroughs, delivering level innovation in protection and comfort. This "full cut" design takes helmet design in a new direction for riders seeking style over speed, prioritizing safety above all. Executive Protection and Mips Spherical Technology ✅ Engineered with two layers of foam to manage impact energy across different speeds: Mips Spherical: This technology utilizes a pair of foam layers that work like a ball and socket to redirect impact energy in a crash, eliminating contact with hard plastic against the skin. Progressive Layering™: Two different materials manage impact energy: EPS Layer: Well suited to high-speed crashes. EPP Foam Layer: Lower density foam with rebound characteristics to address low-speed, roll-around-in-the-dirt-type spills. Enhanced Coverage: The "full cut" design further enhances protective capability. ✅ Advanced Comfort and Ventilation ✅ Focusing on optimal cooling and integrated systems: Fit System (ROC LOC® AIR DH): This revolutionary system enhances cooling, fit comfort, and stability by slightly suspending the helmet off the skull, allowing cool airflow over the head. Cheek Pad Ventilation: Allows cool, fresh air to circulate inside the helmet for cooling and sweat management. Stack Ventilation: Vents at the brow line help draw warm air away from your goggles to eliminate fogging, ensuring seamless integration. Construction and Usability ✅ Highlighting durability and convenience: Shell Construction: HARDSHELL WITH IN-MOLD HARDBODY™ LOWER WRAP—a two-piece shell combining a tough outer shell with a polycarbonate lower shell permanently fused to the liner for durability without excess weight. Visor: Tool-Free, Bolt-On Visor that is easily adjustable and offers plenty of vertical adjustment to stage goggles. The Giro Tyrant Helmet is the choice for maximizing innovative, multi-speed impact protection and advanced cooling technology in a stylish, full-coverage design. Giro Tyrant Spherical Helmets Size Chart for Giro Tyrant Spherical Bicycle Helmets. Size Measurements Size Circumference (cm) S 51 - 55 cm M 55 - 59 cm L 59 - 63 cm XL 63 - 65 cm
