The follow-up to the popular HJC AR-10 III Helmet, the HJC H10 packs the same great features that are ideal for all levels of competition. Equipped with HJC's ACS (Advanced Channeling Ventilation System), the helmet includes two top-front vents, two chin-bar vents, and two rear exhaust ports, combining to flush out heat and humidity and keep your head cool in even the hottest conditions. The redesigned interior is covered with a soft fire-resistant, moisture wicking fabric to help keep things cool and dry. Pre-installed with Hans-compatible M6 terminals for easy installation of your head and neck restraint, and available in White or Flat-black colors.
HJC Helmet Sizing
| Size | X-Small | Small | Medium | Large | X-Large | XX-Large |
|---|---|---|---|---|---|---|
| Measurement(in) | 21-1/4 - 21-5/8 | 22 - 22-1/2 | 22-7/8 - 23-1/4 | 23-5/8 - 24 | 24-3/8 - 24-3/4 | 25-1/4 - 25-5/8 |
| Metric (cm) | 54 - 55 | 56 - 57 | 58 - 59 | 60 - 61 | 62 - 63 | 64 - 65 |
| Hat Size | 6-3/4, 6-7/8 | 7, 7-1/8 | 7-1/4, 7-3/8 | 7-1/2, 7-5/8 | 7-3/4, 7-7/8 | 8, 8-1/8 |
An effective helmet is one that fits properly. Have an assistant use a measuring tape, or a piece of string to measure the circumference of your head starting at a point approximately one inch above the eyebrows in front, around a point in the back of the head that results in the largest possible measurement, and finally wrapping back to the front. It is a good idea to take several measurements to make sure you have the largest one.