One of the industry’s bestselling helmets ever, the 509 Altitude series excels across four key principles: safety, performance, fit, and style. Revolutionary design means precision fit and sleek profiling that exceeds the competition, plus innovative venting and all-day comfort for aggressive riding. Built to exceed athlete expectations, the 509 Altitude Pro Helmet features the MIPS Brain Protection System for ultimate safety, Fidlock® magnetic buckle for easy one-handed operation, plus a customizable breathbox and vent closures.

Features:

• Removable vent stoppers for customized ventilation
• Comes standard with universal camera mount
• Comes standard with Fidlock® easy-open magnetic strap clasp
• Comes standard with our new Pro Series Liner and Cheekpads
• Comes standard with a cold weather breathbox
• Innovative aerodynamic channels & 8 intake/exhaust vent ports
• 11 Sizes across 4 outer shell molds ensure excellent fit, Youth SM - Adult 4X
• Meets and exceeds DOT & ECE 2205 safety certification standards
• One piece eye port trim
• Perfect 509 goggle fit
• Revolutionary neck brace ready shell profile
• Custom fit eps, specially designed for North America
• Special designed expanded polyurethane chin insert
• Removable, washable premium liner
• Dual density, interlocking eps
• DOT/ECE helmet weight from 1380 grams
• Medium helmet weighs 3 lbs., 4 oz.

What is Mips?

In a helmet with MIPS Brain Protection System (BPS) the shell and liner are separated by a low friction layer. When a helmet with a MIPS Brain Protection System is subjected to an angled impact, the low friction layer allows the helmet to slide relative to the head. The MIPS BPS is designed to add protection in helmets against the rotational motion. The rotational motion is a combination of rotational energy (angular velocity) and rotational forces (from angular acceleration) that both affects the brain and increases the risk for minor and severe brain injuries. MIPS BPS has been proven to reduce rotational motion when implemented in a helmet by absorbing and redirecting rotational energies and forces transferred to the brain.