HJC is best known for a line of affordable motorcycle helmets, but they also offer several SA SNELL approved auto helmets. The one I have is the HJC AR10, the most affordable model at $300 retail. There is also an AR-11, which is similar to the AR-10 but adds an aerodynamic "spolier", a carbon fiber version (HX10) and a super lightweight Si-12.

The build quality and fit and finish of the HJC helmets is one thing that steered me towards them. The fit and finish of the AR-10 is noticeably better then most comparably priced helmet. The shield attachment screws are also metal, while many helmets at this pricepoint have use plastic screws.

I'd say the eyeport size of the AR10 is average. At first, I thought I wanted a helmet with a larger eyeport, because psychologically I thought I would have better vision. However, I found that the helmets with smaller eyeports don't significantly limit vision. With the AR10, I don't have any issues with peripheral vision or checking the gauges. I beleive if you're racing karts or open cockpit cars, a smaller eyeport could be safer since it will be less area for debris to penetrate through the shield.

For ventilation, the AR-10 has two adjustable vents in the front above the visor, and two vents in the rear. Although it does not have vents in the chin area, I've had no issues due to lack of ventilation. I've also had no issues with fogging, even in the rain.

Another problem I've had with several rental/borrowed helmets I've used is wind buffeting at higher speeds in karts or open wheel cars. At times I've had a helmet shaking back and forth on my head at high speeds which is not the most comforting feeling. I believe this is due to a non aerodynamic shape of some helmets which may be more designed for closed cockpit cars, and also poorly fitted helmets. I've had no problem with this in the AR10 in this regard, even without the aerodynamic spoiler on the AR11, which shares the same shape as the AR10. I think the fact that HJC had decades of experience in motorcycle helmets may give it an advantage in this regard over manufacturers like Simpson or Bell.

The fit is obviously one of the most important factors in purchasing a helmet. I haven't been able to find a helmet that fits my head perfectly, but the AR10 is among the best I've tried. The helmet is very comfortable

The AR-10 is also relatively lightweight. This was particularly important to me since neck fatigue has been an issue for me. SoloRacer has a comparison of helmet weights of several popular helmets. The AR-10 is one of the lightest fiberglass helmets, with the exception of the super light HJC Si-12, while carbon fiber helmets are also generally lighter.

Overall, for the price I think it's hard to beat the HJC AR-10 helmet. I definitely happy with mine.