N90-3 Helmet
| Size |
Centimeters |
Inches |
| 2XS |
54 |
21.25 |
| XS |
55 |
21.625 |
| S |
56 |
22 |
| M |
58 |
22.75 |
| L |
60 |
23.625 |
| XL |
62 |
24.375 |
| 2XL |
63 |
24.75 |
N21 Helmet
| Size |
Centimeters |
Inches |
| 2XS |
54 |
21.25 |
| XS |
55 |
21.625 |
| S |
56 |
22 |
| M |
58 |
22.75 |
| L |
59 |
23.5 |
| XL |
61 |
24.375 |
| 2XL |
63 |
24.75 |
| 3XL |
64 |
25.5 |
N40-5 Helmet
| Size |
Centimeters |
Inches |
| 2XS |
54 |
21.25 |
| XS |
55 |
21.625 |
| S |
56 |
22 |
| M |
58 |
22.75 |
| L |
60 |
23.5 |
| XL |
62 |
24.375 |
| 2XL |
63 |
24.75 |
N70-2 X / GT Helmet
| Size |
Centimeters |
Inches |
| 2XS |
53 |
20.875 |
| XS |
55 |
21.625 |
| S |
56 |
22 |
| M |
58 |
22.75 |
| L |
61 |
24 |
| XL |
62 |
24.375 |
| 2XL |
63 |
24.75 |
| 3XL |
65 |
25.5 |
N87 Helmet
| Size |
Centimeters |
Inches |
| 2XS |
54 |
21.25 |
| XS |
55 |
21.625 |
| S |
56 |
22 |
| M |
58 |
22.75 |
| L |
61 |
24 |
| XL |
62 |
24.375 |
| 2XL |
64 |
25.125 |
| 3XL |
65 |
25.5 |
N100-5 Helmet / N80-8
| Size |
Centimeters |
Inches |
| 2XS |
54 |
21.25 |
| XS |
55 |
21.625 |
| S |
56 |
22 |
| M |
58 |
22.75 |
| L |
60 |
23.5 |
| XL |
62 |
24 |
| 2XL |
64 |
24.75 |
| 3XL |
65 |
25.5 |
Sizing information is provided by the manufacturer and does not guarantee a perfect fit. Please use this chart as a guide only.