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Gmax Helmets Sizing Chart

We ask that you use the following information to help choose the proper size helmet. In order for a helmet to protect properly and be the most comfortable, it must be sized to your head correctly.

To find the correct size helmet for a persons's head:

  1. Measure the head circumference one-inch above the eyebrows and ears.
  2. Using the circumference measured, use the chart to find the approximate size.
  3. Have the person try the helmet on and see if it feels snug equallly around the head. The helmet should not feel too tight or too loose at any point around the head.
Please remember that all head shapes vary slightly
and that this sizing chart is to be used as a starting guide,
not and exact guide.
Size Inches Metric Hat Size
Youth Small 18 7/8 - 19 1/4 47-48cm 6 - 6 1/8
Youth Medium 19 11/16 - 20 1/16 49-50cm 6 1/4 - 6 3/8
Youth Large 20 7/16 - 20 7/8 51-52cm 6 1/2 - 6 5/8
Adult X-Small 21 1/4 - 21 5/8 53-54cm 6 3/4 - 6 7/8
Adult Small 22 - 22 7/16 55-56cm 7 - 7 1/8
Adult Medium 22 13/16 - 23 1/4 57-58cm 7 1/4 - 7 3/8
Adult Large 23 5/8 - 24 59-60cm 7 1/2 - 7 5/8
Adult XL 24 3/8 - 24 13/16 61-62cm 7 3/4 - 7 7/8
Adult 2XL 25 3/16 - 25 5/8 63-64cm 8 - 8 1/8
Adult 3XL 26 - 26 3/8 65-66CM 8 1/4 - 8 3/8 
Adult 4XL  26 1/2 - 26 5/8 67-68cm 8 1/2 - 8 5/8