N90-3 Helmet
| Size |
Centimeters |
Inches |
| 2XS |
54 |
21 1/4 |
| XS |
55 |
21 5/8 |
| S |
56 |
22 |
| M |
58 |
22 3/4 |
| L |
60 |
23 5/8 |
| XL |
62 |
24 3/8 |
| 2XL |
63 |
24 3/4 |
N21 Helmet
| Size |
Centimeters |
Inches |
| 2XS |
54 |
21 1/4 |
| XS |
55 |
21 5/8 |
| S |
56 |
22 |
| M |
58 |
22 3/4 |
| L |
59 |
23 1/2 |
| XL |
61 |
24 3/8 |
| 2XL |
63 |
24 3/4 |
| 3XL |
64 |
25 1/2 |
N40-5 Helmet
| Size |
Centimeters |
Inches |
| 2XS |
54 |
21 1/4 |
| XS |
55 |
21 5/8 |
| S |
56 |
22 |
| M |
58 |
22 3/4 |
| L |
60 |
23 1/2 |
| XL |
62 |
24 3/8 |
| 2XL |
63 |
24 3/4 |
N70-2 X / GT Helmet
| Size |
Centimeters |
Inches |
| 2XS |
53 |
20 7/8 |
| XS |
55 |
21 5/8 |
| S |
56 |
22 |
| M |
58 |
22 3/4 |
| L |
61 |
24 |
| XL |
62 |
24 3/8 |
| 2XL |
63 |
24 3/4 |
| 3XL |
65 |
25 1/2 |
N87 Helmet
| Size |
Centimeters |
Inches |
| 2XS |
54 |
21 1/4 |
| XS |
55 |
21 5/8 |
| S |
56 |
22 |
| M |
58 |
22 3/4 |
| L |
61 |
24 |
| XL |
62 |
24 3/8 |
| 2XL |
64 |
25 1/8 |
| 3XL |
65 |
25 1/2 |
N100-5 Helmet
| Size |
Centimeters |
Inches |
| 2XS |
54 |
21 1/4 |
| XS |
55 |
21 5/8 |
| S |
56 |
22 |
| M |
58 |
22 3/4 |
| L |
60 |
23 1/2 |
| XL |
62 |
24 |
| 2XL |
64 |
24 3/4 |
| 3XL |
65 |
25 1/2 |
How to measure
Wrap a cloth measuring tape around your head just above your eyebrows. Pull the tape comfortably snug, and read the length.
Sizing information is provided by the manufacturer and does not guarantee a perfect fit. Please use this chart as a guide only.
