Bike helmet size

[Princessdrive]

Considering Bontrager  Solstice helmet. My head size is 57 cm.

Should I get the s/m or m/l size?

[REI-JenK]

@Princessdrive thanks for the question! Looks like both sizes will technically fit; we'd recommend sizing up, as there's a little more room for adjustment in the M/L based on 57cm. The extra space means more airflow and more room to add a thin cap underneath for additional warmth. Hope this helps!

[TrailRANner]

@Princessdrive I would also recommend the m/l. The s/m will technically fit but doesn’t leave room for any cold weather riding we’re you might wear a buff or cap underneath.