The heart of the Helios's extraordinary design and performance is Spherical Technology, which utilizes a ball-and-socket design powered by Mips, the market-leading brain protection system that can help to reduce rotational forces. Spherical Technology allows the helmet's outer liner to rotate around the inner liner during a crash, and also allows Progressive Layering of the inner and outer liners to provide more comprehensive protection and performance. In addition to advanced head protection, the Helios's 15 Wind Tunnel vents provide exceptional cooling power that's enhanced by Giro patented Roc Loc 5 Air fit system and plush, antimicrobial XT2 padding for exceptional sweat absorption. It's the ideal match for your road and gravel adventures.
Size Guide
| HELMET SIZE | Head Circumference |
|---|---|
| S | 51 - 55 cm |
| M | 55 - 59 cm |
| L | 59 - 63 cm |
| XL | 63 - 65 cm |
| Universal Adult | 54 - 61 cm |
| Universal Women's | 50-57 cm |
| Universal XL | 58-65 cm |
HEAD CIRCUMFERENCE — Wrap a measuring tape around the head, keeping the tape level from front to back. Note the measurement and reference the Size Guide.
Note — A Giro helmet should fit with a little room when the fit system is loose, and sit low enough to protect your forehead without hindering your vision. From there, you can adjust the fit so it is more secure and comfortable.
