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Sena Helmets Size Chart

Adult Helmets

SIZE

CENTIMETER

INCHES

HAT SIZE (inches)

XS 53 - 54cm 20 7/8 - 21 1/4 6 5/8 - 6 3/4
S 55 - 56cm 21 5/8 -22 6 7/8 -7
M 57 - 58cm 22 1/2 - 22 6 7/8 -7
L 59 - 60cm 23 1/4 - 23 5/8 7 3/8 - 7 1/2
XL 61 - 62cm 24 - 24 3/8 7 5/8 - 7 3/4
2XL 63 - 64cm 24 3/4 - 25 1/8 7 7/8 - 8


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