Sizing chart for the Stilo Helmets:

Head circumference (cm) Size
53 XS
55 S
57 M
59 L
60 L/XL
61 XL
63 XXL
64 XXXL



Sizing chart for the Bell Helmets:

Head circumference (cm) Size
54 to 55.5 XXS
55.5 to 57 XS
57 to 58.5 S
58.5 to 60 M
60 to 61.5 L
61.5 to 63 XL


Sizing chart for the Sparco / GT2i Helmets:

Head circumference (cm) Size
51 to 53 XXS
53 to 54 XS
55 to 56 S
57 to 58 M
59 to 60 L
61 to 62 XL
63 XXL

Sizing chart for the GT2i Pro / Club Helmets:

Head circumference (cm) Size
53 XS
55 S
57 M
59 L
60 L/XL
61 XL
63 XXL