Alpinestars Helmets Size Charts

Alpinestars helmets are designed to fit snug and secure when properly sized. For additional guidance, refer to our helmet sizing guide or contact our customer service team.

Road & MX Helmets

Alpinestars helmets designed for both road riding and motocross use.

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Size	Head Circumference (cm)	Head Circumference (in)
XS	53 - 54	20.8" - 21.2"
S	55 - 56	21.6" - 22"
M	57 - 58	22.4" - 22.8"
L	59 - 60	23.2" - 23.6"
XL	61 - 62	24" - 24.4"
2XL	63 - 64	24.8" - 25.2"

Vector Series (MTB/ATB)

Alpinestars Vector Series MTB helmets designed for trail and all-terrain riding.

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Size	Head Circumference (cm)	Head Circumference (in)
S	51 - 55	20" - 21.6"
M	55 - 59	21.6" - 23.2"
L	59 - 63	23.2" - 24.8"

Sizing information is provided by the manufacturer and does not guarantee a perfect fit. Please use this chart as a guide only.