Coupon LABORDAY20 applies to select full-price merchandise only. Offer applies to a single eligible item per order. Online only: offer not available in store. Offer available exclusively to Als.com email subscribers – enroll at checkout. Offer valid through 9/7/2026 at 11:59pm MST. Coupon codes are not stackable: one code per order. Offer is limited on on-hand items only. Offer is not transferable and is not redeemable for cash. Not valid on special orders, gift cards, tax, shipping, rentals, previous purchases or bundle discounts. Brand and category exclusions apply. Offer subject to change without notice. See als.com/promotions for details. |
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.
