Whether you’re bombin’ down the mountain, going for a KOM, or just cruising the trails, you should have a helmet on your head to protect your noggin. The Giro Tyrant MIPS Helmet is designed to meet the needs of today’s progressive trail riders. The Tyrant has Wind Tunnel Ventilation and MIPS Spherical technology that utilizes a pair of foam layers that work like a ball and socket to redirect impact energy in a crash. The EPS foam helps protect during high-speed crashes and the EPP foam takes care of low-speed crashes. With the Roc Loc Air fit system, you can easily dial in the perfect fit. Features Hardshell with in-mold polycarbonate creates a sturdier helmet Roc Loc Air makes it easy to dial in the perfect fit Technologies MIPS Integrated - MIPS (multi-directional impact protection system) allows you to customize fit/feel for great stability and long-range comfort while providing an added measure of protection from rotational forces in the event of an angled impact. Tool-Free Bolt on Visor – Easily adjustable without the need for tools or extra fiddling, and offers plenty of vertical adjustment to stage goggles when you are not wearing them Spherical Technology - Spherical Technology’s Ball-and-Socket design, powered by MIPS, helps redirect impact forces away from the brain by allowing the outer liner to rotate around the inner liner during a crash. It also eliminates contact with hard plastic or slip-planes against the skin. Progressive Layering – Two different materials are used to manage impact energy, One layer is EPS, which is well suited to high-speed crashes. The other is a lower density EPP foam with rebound characteristics to address low-speed, roll-around-in-the-dirt-type spills. Cheek Pad Ventilation – Allows cool fresh air to circulate inside the helmet to help keep you cool, and to address sweat management Specifications Construction Weight Ventilation Fit System Certification Hardshell with in-mold polycarbonate hardbody lower wrap progressive layering with eps outer liner and epp inner liner 600g (Size Medium) Channeled stack ventilation at brow line 14 vents with internal channeling Super fit Roc Loc Air Complies with the us cpsc safety standard for bicycle helmet for persons age 5 and older e.u.: ce en1078 Size Guide Adult Super Fit Size Circumference S M L 51 – 55 cm 55 – 59 cm 59 – 63 cm