- Integrated MIPS brain protection system
- 17 vents for optimal airflow
- Roc Loc 5 fit system for comfort
- Adjustable moto-style visor
- Durable polycarbonate shell construction
The Giro Source MIPS MTB Helmet in Matte Dusty Rose Cosmic offers exceptional performance and protection for trail enthusiasts. Designed with deep coverage and aggressive ventilation, it features 17 vents and internal channeling to keep you cool during intense rides. The Roc Loc 5 fit system ensures a secure and comfortable fit, while the integrated MIPS technology enhances safety by reducing rotational forces during impacts. With a stylish adjustable visor and robust polycarbonate shell, this helmet is perfect for adventurous cyclists seeking both style and functionality.
Giro Adults Helmet Sizing Chart
Adult Super Fit
SM | MD | LG | XL |
51 - 55 cm | 55 - 59 cm | 59 - 63 cm | 61 - 65 cm |
Adult Full Face Super Fit
SM | MD | LG | XL |
51 - 53 cm | 51 - 55 cm | 55 - 59 cm | 59 - 63 cm |
Adult Universal
Model | Size (CM) |
Women | 50 - 57 cm |
Adult Unisex | 54 - 61 cm |
Extra Large | 58 - 65 cm |
Youth Helmets
Model | Size (CM) |
Scamp XS | 45 - 49 cm |
Scamp SM | 49 - 53 cm |
Dime XS | 47 - 51 cm |
Dime SM | 51 - 55 cm |
Dime Universal | 50 - 57 cm |
Tremor Youth | 50 - 57 cm |

Giro was founded more than 30 years ago by Jim Gentes, a man with an obsession for design and answering unmet needs. That obsession led him to start making his own products, and ultimately resulted in a company committed to serving the rider through personal expression and advanced performance. Our world has changed dramatically in the past three decades, but Giro has remained steadfastly committed to serving enthusiast riders. Giro is the brand that sweats the details because they understand that riding is more than just a fleeting hobby or a passing fad. Riding is the best part of a great life and your equipment deserves attention to even the smallest of details.
Click & Collect Available
• In-stock items usually ready in 4 hours* • Online Only items usually ready in 1-3 working days More info »
Courier Delivery Available
• $9.99 for orders $99 & under • Free for orders over $99 • Bulky shipping fees apply for bikes & bulky items based on item weight More info »