Giro Ratio Men's Helmet 2025

Beneath the sleek silhouette, you'll find the adjustability of an In Form fit system, Thermostat Control adjustable venting and compatibility with aftermarket audio systems by Outdoor Tech.

• Hard Shell construction: EPS foam liner
• Compatible with aftermarket Giro audio systems by Outdoor Tech
• Fit System - easy to dial in a custom fit in seconds, even with gloves on. Ergo-friendly dial at the base of the helmet that provides up to 6cm of adjustment and enhanced stability
• Seamless Compatibility with all Giro goggles:
• 610g (size Medium)
• Seamless Compatibility with all Giro goggles
• Hard Shell construction produces great helmets at a great value. A rugged outer shell is molded and then attached to the EPS foam liner.
• Thermostat Control adjustable venting - allows custom-tuning of airflow instantly with a simple, low-profile control button on the outside of the helmet
• Stack Vent Technology