How to Choose a Bike Helmet

Triple certified for skiing, climbing and biking, the Mammut Haute Route climbing/bike/snow helmet keeps things simple so you'll only need one helmet for your days out playing in the mountains.
Imported.
Best Use | Snowsports Climbing Mountain Biking |
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Helmet Style | Snow Climb Mountain Bike |
Helmet Construction | Hybrid |
Shell Material | Polycarbonate |
Head Circumference | 51-55 CM: 20-21.6 inches 59-63 CM: 23.25-24.8 inches |
Vents | 18 |
Visor/Brim | Yes |
Weight | 51-55 CM: 12 ounces 59-63 CM: 14 ounces |
Gender | Unisex |
Sustainability | Contains recycled materials |
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I already own a Mammut climbing helmet that fits somewhat large. I’m a 58 cm head circumference and already own the medium version of the Mammut climbing helmet. Thinking the sizing should be spot on I ordered the 55-59 cm size of this helmet. I couldn’t even get it on my head all the way. I don’t understand why the sizing would be so off.
Circumference is 59cm so I went with L because I know mammut's sizing is a bit small for its stated size usually...This helmet is HUGE. Sizing seems a bit off from the rest of Mammut's line. Word to the wise, try on before you buy...