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Interior Liner Thickness for Quantum X / DT-X

Helmet Size	Lining Code	12 mm	10 mm	7 mm	5 mm
XS	I		Optional	Standard
S	II		Optional	Standard	Optional
M	III	Optional	Standard	Optional	Optional
L	III	Optional	Optional	Standard	Optional
XL	IV		Optional	Standard	Optional
2XL	V		Optional	Standard

Sizing information is provided by the manufacturer and does not guarantee a perfect fit.

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Arai Quantum X / DT-X Helmet Liner Sizing