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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
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Arai Signet-Q Hydra Helmet 5 5 4 4
If you're getting hot spots in the center of your forehead this is for you. I rode with an RX-Q for two years. It's a fine helmet but after about 20-30 minutes of riding i would get a burning sensation in the middle of my forehead. I figured I had a long oval head shape and sure enough after riding with the Signet-Q for 4 hours my head felt fine. The Signet-Q also has more customizable options in the form of padding removal. The fit is perfect and I recommend it to anyone who gets those forehead hotspots. May 5, 2015
Best helmet Been riding for over 30 years so I've owned many helmets. Most of them have been Arai's. This one is by far the best. August 26, 2014
Awesome Helmet, and Sick Graphics!!! This Helmet is Fantastic! The graphics are sick. The helmet fit my head perfectly right out of the box, but i was amazed with the helmet's fine tune ability. The helmet has lots of vents, and it keeps pretty cool. All my friends are amazed at how light the helmet is compared to theirs. Overall I do recommend this helmet. It might seem a bit on the pricy side, but you can't but a price on your life. August 4, 2014
Long Oval Heads, Rejoice! Bought this because I have a long oval head shape and the vast majority of helmets don't fit me. This one fits perfectly. In fact, now that I have it, I realize I never had a properly fitting helmet before! I've had a few that caused pressure points, and a few that were loose. This one - perfect. It doesn't feel tight, and it doesn't feel loose - it's just right. Other than that - noise level is less than my previous helmet, but still quite a bit of wind noise. Visor is crystal clear, gorgeous. Thoughtful vents. Arai quality - all you need to know really. About the design - this helmet, like most Arais, looks much better in person than on the pics. It's drop dead gorgeous. July 4, 2014
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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, 8 Answers
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RevZilla Store asked: Why did you choose this?
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 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
Reply to clement Good answer? Yes (0) No (0)
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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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: Usually ships in 1-2 business days
Black / SM 940670 816501 In Stock: Ships next business day
Black / MD 940671 816502 In Stock: Ships next business day
Black / LG 940672 816503 In Stock: Usually ships in 1-2 business days
Black / XL 940673 816504 In Stock: Usually ships in 1-2 business days
Black / 2XL 940674 816505 In Stock: Usually ships in 1-2 business days