MTB Helmet Size Chart

Model	XS/M		M/XL
	Head Circumference		Head Circumference
	EU/cm	US/in	EU/cm	US/in
Short Stack NoShock / Short Stack	53–57	20.85"–22.45"	57–61	22.45"–24.00"

Model	S/M		L/XL
	Head Circumference		Head Circumference
	EU/cm	US/in	EU/cm	US/in
Brain Box NoShock / Brain Box	53–58	20.85"–22.85"	59–64	23.25"–25.20"

Measurement Guide

Use a tape measure to find your head circumference. Measure from the middle of the forehead, above the ears, to the back of the head.

Not the right size?

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Summary of Terms: Free shipping on orders $/€100+ and free 100-day size and product exchanges in the US and EU. Refunds incur a $/€10 return label fee. Pro Program, ExpertVoice, OutdoorProLink, and orders with discounts over 40% are eligible for exchanges only and incur a $/€10 fee. All returns must be unused, in original packaging, and in sellable condition. Delivery times are estimates, depend on availability, and orders are processed first come, first served. For customers outside the US and EU and full policy details, see our FAQs.