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Arai Signet-Q Hydra Helmet
  • Arai Signet-Q Hydra Helmet - Black
  • Arai Signet-Q Hydra Helmet - Black

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Video Reviews (4)

Arai Signet-Q Hydra Helmet Videos

Arai Signet-Q Hydra Helmet

The Arai Signet-Q (the long-oval shaped cousin to the RX-Q) is the product of a racing lineage going back to the late 1970’s. Since Arai’s inception, their RX Line of helmets has set an international standard for rider comfort and safety. The Signet-Q is perfection incarnate, blending modern materials and safety features with decades of knowledge and racing heritage. The result are features like an eyeport designed to maximize peripheral vision, an aerodynamically tuned outer shell and a beautifully crafted and ultra comfortable liner. All these features, combined with industry-leading protection, provide riders with an unmatched level of safety and comfort.

A longer shell shape on the Arai Signet-Q Helmet gives 5mm more space front to back allowing for a larger number of heads to fit comfortably. The shape of the Arai Signet-Q Helmet releases forehead pressures and eliminate hot spots for a more comfortable fit every time.  This shape works best for riders with a long oval headshape.


  • Both the top vent set and side exhaust cowls are direct carryovers from the RX-Q 
  • Brow vent ducting redirects to flow air across the temples
  • DDL-4 exhaust vent to the 10mm wider eye port (5mm on each side)
  • Long Oval Fit
  • SAI "MAX-Vision Brow Vent" shield
  • Clear Pinlock Max-Vision Brow Vent Pinlock lens included
  • Elongated shell adds 5mm from front to back
  • Long-Oval shape helps prevent “Hot-Spot”
  • Multi-Density Single piece EPS liner
  • Removable, replaceable, washable interior
  • Dry-Cool Surface material for rapid displacement of heat and moisture away from your head and into the ventilation airflow for added comfort while riding and a quick dry between rides
  • 5mm peel-away temple pads adds another level of customization, giving the helmet interior a little extra width when needed
  • Enhanced for customizable micro fitment interior without the need to purchase extra interior components
  • New FCS (Facial Contour Support) cheek pad design
  • Innovative and exclusive spring support adds just the right amount of pressure when needed while being worn
  • Meets or exceeds Snell and D.O.T. standards

Arai Helmet Sizing:

Wrap a cloth measuring tape around your head just above your eyebrows. Pull the tape comfortably snug, and read the length.

Size Head (in) Head (cm)
2XS 20 - 20 1/2 51 - 52
XS 20 7/8 - 21 1/4 53 - 54
SM 21 5/8 - 22 55 - 56
MD 22 1/2 - 22 7/8 57 - 58
LG 23 1/4 - 23 5/8 59 - 60
XL 24 - 24 3/8 61 - 62
2XL 24 3/4 - 25 1/8 63 - 64
3XL 25 1/2 - 26 65 - 66

Sizing information is provided by the manufacturer and does not guarantee a perfect fit.

Click here to see the full Arai Helmets Size Chart

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Product Style RevZilla Item # Manufacturer Product # Availability
Black / XS 940669 816500 In Stock: Ships within 24 hours
Black / SM 940670 816501 In Stock: Ships within 24 hours
Black / MD 940671 816502 In Stock: Ships within 24 hours
Black / LG 940672 816503 In Stock: Ships within 24 hours
Black / XL 940673 816504 In Stock: Ships within 24 hours
Black / 2XL 940674 816505 In Stock: Ships within 24 hours


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If your order arrives and it is not right, we will we'll fix it, NO NONSENSE, we promise.

Doesn't fit or just not happy with it? You can return any new, unused and unaltered item within 30 business days of delivery receipt of your item. We will issue a full refund to your original payment method.

See our full Return Policy for all of the pertinent details.

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Arai Signet-Q Hydra Helmet 4.8 5 301 301
arai Very comfortable, light weight, and comfortable. Pin locks works great. November 23, 2015
great helmet for long oval head shape This was my first Arai helmet ever and I am pleased with it. I took it on a 2500 mile trip this summer just after purchasing it and I would say that no break in period was even needed for me to see positive results. I have a long oval head shape, and other helmets have been miserable, putting too much pressure on various head pressure points. I can comfortably ride 100+ mile stretches without needing to constantly adjust the helmet to relieve pressure like on other helmets. If you have a long oval head, this is worth the investment. November 9, 2015
Great helmet This is an awesome helmet. I've used a couple different brands and this one is by far the most comfortable to wear and has great noise reduction. It's very easy to adjust the airflow while wearing it and riding if necessary as well. October 26, 2015
Nice fit for long oval head I chose this helmet because it specifically was designed for long oval head shapes, which I have. I like the fit of it very much. My bike is in the shop right now, so I can't comment on the rideability aspects of the helmet yet. October 20, 2015
Good helmet, but not a Profile fit. I previously had an Arai Profile and this helmet is a nice upgrade as it's much more quiet and the sun shade is a nice feature. But, be warned, this might be a long oval, but it's not a replacement for a Profile as it fits much more snug than the Profile and has left me with hotspots in the back of the head after longer rides over 1.5 hours (with my profile I could ride all day long). If the fit was more like the Profile, I would have given it five stars. October 14, 2015
Excellant helmet! Was debating for a while to get this helmet as my previous one HJC 10 was fine. But am very glad I did! Use it for street and track. Fit is perfect for my head as I've only found a few that are truly comfortable. Overall quality is great, vision is great, airflow is great, nice attention to detail everywhere. Chin strap is comfortable too. If you're thinking about it, get it you won't be disappointed. Wish I got it sooner. October 9, 2015
There is a reason it has five stars By the time I need a new helmet this will have cost well less that $0.25/hour of use. I really wanted to like the Shoei GT Air, but it just didn't fit my head. I don't know why I bothered. FWIW, this is my third Signet. First was an e, then a GT, now a Q. Thank you Arai for bringing this back. I wore an RX7RR4 for a long time, but it was never as comfortable. September 30, 2015
Overall great helmet. Perfect fit, comfortable and not heavy on head. Needed a special size and found this was the best and fits all my needs. Very satisfied and Revzilla staff extremely helpful and knowledgeable. September 28, 2015
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Have a functionality, fit, or otherwise product-specific question about the Arai Signet-Q Hydra Helmet? Ask it here! If you have a customer service or shipping question, please direct it to our Customer Service department.

Arai Signet-Q Hydra Helmet
Already Asked: 4 Questions, 9 Answers
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RevZilla Store asked: Why did you choose this?
mark y: Company reputation and it looks awesome. Fits my mellon perfect. Jul 22, 2015
Lisa D: The graphics on ths model are stunning in person. Added this one to my Basilisk model just because they look so awesome on the wall together. Apr 19, 2015
Ryan I: Got a long oval noggin and the RX-Q was giving me a hotspot on my forehead. I also didn't want a solid colored helmet. Apr 11, 2015
Edward L: Gonna see this helmet Live see if its as cool in person - last helmet was signet-q usa flag graphics loved the helmet, replacing it cause i crashed my Ninja 1000 and yes i hit my head! Arai saved my Life and at the Least from getting a concussion. Never blacked out or saw stars Thank You Arai, Only helmet i buy and wear! p.s. 3rd one - retired the 1st,

This Helmet was sweet - even better looking in person!
Sep 22, 2014
jesse h: I had a friend tell me how nice these products felt. So I went and tried one on and had to agree. that lead me here and I like that it has more ventilation then my current helmet. I also like the art work. Aug 26, 2014
Mario J asked: Can the face shield be swapped out on this model for, say, a dark smoke visor? Jun 9, 2015
Answer this · Send to friends Good question? Yes (0) No (0)
clement f: Yes it can. There are two ways to go about this. First option you can replace the insert inside the face shield, which uses the pin lock system or you can replace the whole face shield. If you look on Revzilla website they both parts. Hope this helps. Jun 9, 2015
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Mario J: NVM, I found Arai SAI Face Shield is compatible. Jun 9, 2015
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William H asked: Anthony, I'm calling you out. Why after all this time is there no video for this graffic. Don't let Ruben or Brian Vance post a traffics video befor you. I was under the impression Revzilla was the king? Jul 12, 2014
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William H: Hail to the king baby.-Bruce Campbell Jul 12, 2014
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William H asked: Can we please get a video of this helmet? Jun 5, 2014
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William H: Video please Jul 11, 2014
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