Giro Seam Helmet
Wrap a soft tape measure around your head, keeping it level from front to back, just above your ears and eyebrows. Note the measurement and find your size below. The helmet should fit with a little room when the fit system is loosened, and sit low enough to protect your forehead without blocking your vision. Once you have the right size, dial in the fit with the adjustment system.
Adult helmets
| Size | Head circumference | Approx. inches |
|---|---|---|
| S | 52 – 55.5 cm | 20.5 – 21.9 in |
| M | 55.5 – 59 cm | 21.9 – 23.2 in |
| L | 59 – 62.5 cm | 23.2 – 24.6 in |
| XL | 62.5 – 65 cm | 24.6 – 25.6 in |
Race helmets
| Size | Head circumference | Approx. inches |
|---|---|---|
| XS | 52 – 53.5 cm | 20.5 – 21.1 in |
| S | 53.5 – 55.5 cm | 21.1 – 21.9 in |
| M | 55.5 – 57 cm | 21.9 – 22.4 in |
| L | 57 – 59 cm | 22.4 – 23.2 in |
| XL | 59 – 60.5 cm | 23.2 – 23.8 in |
| XXL | 60.5 – 62.5 cm | 23.8 – 24.6 in |
Youth helmets
| Size | Head circumference | Approx. inches |
|---|---|---|
| XS | 48.5 – 52 cm | 19.1 – 20.5 in |
| S | 52 – 55.5 cm | 20.5 – 21.9 in |
| M | 55.5 – 59 cm | 21.9 – 23.2 in |
Based on Giro's official snow helmet size guide (centimeters). Inches are converted and rounded; when you are between sizes, go by the centimeter measurement. Questions? Give us a call and we'll help you find the right fit.
All orders of $50 or more.
Fast, easy returns within 30 days.
Giro
The Giro Seam offers exceptional comfort and performance in a lightweight helmet. This in-mold constructed helmet features Thermostat Control adjustable venting with In Form Fit System that allows you to dial in the fit and venting to your needs. On the inside is X-static padding that is anti-odor treated to keep your helmet smelling fresh all season. Sleek and stylish, the Seam helmet is the perfect addition to your winter gear.
Certifications
ASTM 2040 / CE EN1077
Venting
An improved Thermostat� vent system including 12 vents keeps your head warm and goggles clear
Materials
X-Static anti bacterial padding.
Audio
Compatible with all after market TuneUps systems.
Goggle Compatibility
Compatible with goggles.
Features
Adjustable Vents
Features
Visors
Ski and Snowboard
Giro
Mens, Womens, and Unisex Adult
1 Year