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Arai Signet-X Review

El Estrecho "X" Para El Cráneo, This Arai Helmet Will Definitely Help You Stand Out In A Crowd

Arai Signet-X
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Arai Signet-X Review Summary
Review Summary

“The Narrow X For The Cranium”. OK, so it’s my attempt at cuteness using a very limited knowledge of Spanish. But this new Arai Signet-X in the “El Cráneo” graphics does two things really well. First, it gets you noticed. And second, if you’re a member of the Arai “Long Oval” club, this is your helmet.

The Signet-X is, as far as we can tell, identical to the Arai Quantum-X we reviewed recently in every way other than the internal shape. So the Quantum-X is the Arai “Round Oval” (“Round”) internal shape and the Signet-X is for “Narrow” heads.

Thus, this review will have a lot of duplication from our Quantum-X review, although the difference in the internal shape does lend some interesting differences that we will note.

The “X” tag affixed to the latest Arai helmets designates their latest designs. That includes the top-of-the-line Arai Corsair-X (review) and the Arai Quantum-X (review) and now the Signet is the third helmet in the lineup to get the “X” treatment.

The Signet-X replaces, of course, the Arai Signet-Q (review). Whether there will be an “X” equivalent to the Arai Signet-Q Pro Tour (review) remains to be seen. The top of the Arai helmet lineup is still occupied by the Corsair-X, while the Quantum-X and Signet-X now share duties as the slightly less racy sport biking twins in the VP position.

The Corsair-X is outstanding in every way, at a slight cost in both money and noise levels. Otherwise, for the majority of street bikers, the Quantum-X or Signet-X have all of that Arai goodness for $170.00 less.


Paint, Graphics and Overall Quality

The Signet-X has that same solid Arai feel and other than the wild “El Cráneo” graphics on our helmet and the “Long Oval” internal shape it is, as far as we can tell, identical to the Quantum-X in every way. While our Quantum-X was in basic solid white, the El Cráneo graphics are about as colorful as you’ll ever see on any motorcycle helmet.

And the colors are even (sort of) high-viz, which adds some visibility to hopefully cut through the gadget-induced fog of the typical SUV jockey. When we first ran our eyeballs over the El Cráneo graphics, it brought to mind the old Bell Apex (review) from 2006 in the “Yakuza” graphics.

That design wasn’t so popular but the “Day of the Dead” themed El Cráneo graphics may go over pretty well. The overall helmet quality and the design — whether you like it or not — is perfectly executed on this Signet-X, as you’d expect from a (I hope you’re sitting down) $829.95 list price helmet.

Whether any motorcycle helmet is worth that much money is up to you and there are die-hard Arai fans out there who wouldn’t even look at another helmet. I can say that in theory, it would probably cost you a few hundred bucks to, say, have a white Signet-X custom painted, so there’s that. In any case, the Signet-X is everything you’d expect from a modern Arai motorcycle helmet. And then some, if you consider the El Cráneo graphics.

Score: The Signet-X gets an “Outstanding” rating for paint and quality. See the Summary Table at the end of this page for a description of our rating system.
Arai Signet-X Helmet Liner

The “Long Oval” Internal Shape

The original Arai Quantum II (review) from about 15 years ago was a lifesaver for “Round” headed riders. It was discontinued for several years until it was revived in the form of the Quantum-X. The Quantum series — at least in the U.S.A. — had the Arai “Round Oval” internal shape.

The Signet series has been around at least that long and more and it’s been one of the most popular helmets in the Arai lineup. It has the classic Arai “Long Oval” internal shape, said to be the most common head shape for North American riders.

It’s narrower even than the Arai “Intermediate Oval” (read: “Neutral”) helmets like the Arai RX-Q (review), which is now apparently gone from the Arai product line. Arai says the “Long Oval” shape is “Longer front-to-back and a more narrow side-to-side” when compared to the “Intermediate Oval”.

However, the Signet-X still doesn’t seem quite as narrow as older Arai Long Oval helmets, like the also-discontinued Arai Profile (review). I’ve worn them all and I (Rick) have a “Round” or what I call “Earth” shaped head, widest in the middle at the temples and with a flat forehead to boot.

YYet, I can still comfortably fit into the Signet-X, albeit with more room fore-and-aft and at the forehead than the “Round Oval” Quantum-X.

Bottom line here is that the Signet-X is narrower than the Arai “Intermediate Oval” shapes and it’s about the narrowest motorcycle helmet sold today. Note that we have commented on the fact that many helmet manufacturers have somewhat normalized the internal shapes, which are now clustered closer to “Neutral” than they were about 10-15 years ago.

Shell Sizes

I asked Arai about the shell sizes for the Signet-X and here’s what they said:There are 4 shells for the Corsair-X, Quantum-X and Signet-X: XS, SM, ML, XL, XXL and there are 5 shells for the other helmets: XS, SM, ML, XL, XXL/XXXL.

Helmet Fit

The Signet-X in size XL fits as expected for an XL. For more information about head shapes, please read the wBW Motorcycle Helmet FAQ page.

Eyeglass Fit

All of the latest Arai helmets have very good eyeglasses fit, including the Signet-X. I wear the Randolph Engineering Aviator sunglasses (review) with straight temples, designed to fit inside a helmet and they work fine even in the narrower Signet-X.

Liner Comfort

Arai helmets are typically among the most comfortable made and the Signet-X is no exception. The liner and cheek pads are fully removable. The padding is thick and the anti-microbial treated liner fabric feels plush. The Signet-X has narrow removable foam pads under the liner at the 10 and 2 o’clock positions directly on top, which can be removed to adjust the fit slightly.

Again, for more information about head shapes and choosing and fitting a motorcycle helmet, please see the wBW Motorcycle Helmet FAQ page.

As always, remember that helmet fit is crucial to safety and comfort, so make sure you try the helmet on before buying, and try a variety of sizes. The smallest size that fits comfortably is usually the safest.
Arai RX-Q Internal Shape
Score: We give the Signet-X an “Outstanding” for a comfortable fit, a nicely constructed and comfortable liner with comfortable liner material.

Arai Signet-X Dark Visor

Cheek Pads

Like the Quantum-X we reviewed, it’s not immediately apparent how to remove the cheek pads. On both helmets, the emergency release pull tabs are completely hidden under the big chin curtain that is now standard. We think it’s important to ensure that the emergency pull tab label is showing, for the emergency personnel in case you’re in an accident and also because you can use the emergency release pull tabs to remove the cheek pads.

Dig around underneath and you’ll find the orange labels. Be careful though — don’t just start pulling on everything as you’re trying to dislodge the cheek pads.

Also, make sure you look and study carefully how they’re installed, what holds them in and how they are re-inserted. It’s not the same as most helmets, you’ve been forewarned.

When the cheek pads are reinstalled correctly, make sure that the “EMERGENCY” label is just visible, otherwise no one will know about it.
Arai Signet-X Visor Removal


Face Shield, Eye Port and Visibility

The Corsair-X introduced a new Arai face shield design with a completely revised attachment system and it’s now included on the Quantum-X and Signet-X. The points at which the face shield rotates on the sides of the helmet have been lowered and the infamous Arai side pods that have given so many street riders fits have been reduced in size and also completely redesigned.

Arai says that the changes create more smooth helmet shell surface area in the section above the side pods, which helps prevent anything on the helmet from catching or snagging obstructions during a crash and slide. The eye port on the Signet-X is just like the Quantum-X; our feeling is that it’s only about average in terms of outward visibility.

It’s slightly smaller in both the vertical and horizontal planes than the Corsair-X, which is specially designed for racing in a tucked sportbike position.

New Visor and Side Pods

The operation of the newly redesigned face shield system and the revised removal system was described in our Corsair-X review and is fully illustrated in the video included in both our Quantum-X review and in the Signet-X video below.

The side pods now easily release with the push of a lever and the face shield rotating mechanism is then laid bare. It’s very simple to remove and replace the new face shield on the compared to the older system.

By the way, the Signet-X and Quantum-X face shield still has the Arai “infinite” system for raising and lowering. It depends on friction to keep the raised face shield in place.

New Face Shield (Visor) Lock

The other new Quantum-X and Signet-X feature (also first introduced on the Corsair-X) is the face shield lock and catch on the lower left side. It’s a rocker-type lever that pops the face shield off of the lock and allows a (very) small first opening for city defogging/ventilation.

The system easier to use than the old stiff friction snap on older Arai helmets, but it takes some time to learn the new system and develop the muscle memory on the location and operation of the rocker.

The Signet-X (and Quantum-X) also come with the latest generation “Max Vision” Pinlock insert and the face shield has a recess to hold the insert, although the recess is far enough out at the edges to remain unnoticeable.

You’ll need to install the Pinlock for any type of cool-weather riding, because the standard face shield has no anti-fog treatment at all as far as we can tell. But don’t fret; the latest Pinlock inserts are excellent with no discernable distortion. It would have been nice if the Pinlock was installed by Arai at the factory though…
Arai RX-Q Visibility
Score: We’ll give the Signet-X an “Excellent” rating for above average outward visibility and the sealing performance of the face shield.
Arai Signet-X Top Vents

Arai Signet-X Chin Vent

Ventilation Notes

Top Vents

Like the Corsair-X and Quantum-X, the Signet-X continues the Arai tradition for one of the most effective ventilation systems available in any full-face helmet. Arai has been experimenting — or evolving — the top vents on the last few helmet releases and the Quantum-X brings yet another new design. These are angular-shaped scoops with a solid clicking two-position lever located on the outside of each vent.

Having to fuss with two levers rather than one is a bit of a bother and it will take a few tries before your hands figure out the lever location. But one thing’s for sure: the top vents work well, bringing cool air down into the helmet.

Chin Vent

The Signet-X chin vent is standard Arai. It’s what we call the Arai “sugar scoop” (or “feed scoop” for you ex-dairy farmers) type that pours air directly through the chin bar and through a mesh filter bug catcher and then on to your face.

Don’t forget: be careful of how and where you mount the microphone for an intercom system because the air coming through the chin bar vent can generate unwanted background noise in the speakers.

Exhaust Vents

The Signet-X has the same three-hole (on the inside) rear exhaust vent array with a single lever for opening and closing a sliding cover over the dual vent holes. It’s a two-position slider but position one (supposed to be half open) isn’t much different than fully open. This may be a production issue on our particular helmet.

No matter, because we always leave the rear exhaust vent fully open for business, 24/7/365. There are two additional rear exhaust vents along the bottom of the helmet at 4 and 8 o’clock low.

Chin Curtain

The Signet-X and Quantum-X have the big, new, soft, nicely made chin curtain installed at the factory. It’s very nice and it’s effective and much better than the old pull-down chin spoiler.

The old pull-down vestigial chin spoiler is still there, underneath the chin curtain. Arai should eliminate it on their street helmets and save a few pennies.
Arai RX-Q Ventilation
Score: The Signet-X gets an “Outstanding” rating for ventilation.
Arai Signet-X Visor Lock


Helmet Weight

It’s interesting to note that the Quantum-X we reviewed in size XL weighed 1675 grams. This Signet-X in size XL weights 1704 grams. Perhaps the difference is from the added graphics and clearcoat?

The Signet-X meets the DOT standard in the U.S.A. and it’s also Snell M2015 certified and meeting the Snell certification usually means a slight increase in weight.

For more information, be sure to visit the wBW Motorcycle Helmet Weights page for charts comparing the weights of all of the open-face, full-face and flip-up helmets we’ve reviewed.

Score: The Arai Signet-X gets a “Very Good” rating for weight and balance.

wBW Video: Arai Signet-X

Noise Levels

Similar to the Quantum-X, the new top vent system on the Signet-X is has some minor wind rushing noise when the top vents are open. Close the top vents and the noise decreases almost to nothing. Of course, this will all depend on your motorcycle, how the helmet fits and matches your head shape and any windscreen you’re using.

On a motorcycle with a windscreen that directs air right at the top 1/4 of the helmet, the open top vents will generate a lot of wind rushing noise. But we always wear high-quality, correctly fitted ear plugs, so this is usually not an issue

The Signet-X does seem to have more noise around the bottom of the the helmet than the Quantum-X, possibly due to the slight mis-match between the Signet-X internal shape and my head shape.

Note that our helmet evaluations are a combined effort of several riders over time on different types of motorcycles with and without windscreens. Evaluators wear correctly fitted, high quality ear plugs (even when evaluating motorcycle intercom systems).

Always protect your hearing when riding a motorcycle. See the wBW Earplug Reviews for more information on choosing and wearing earplugs.

Note also that perceived noise levels will vary, depending on the individual. Noise can be caused by many factors, including helmet fit, the type of motorcycle and windscreen, wind speed and direction and even the rider’s clothing. For more information on helmet noise, visit the wBW Motorcycle Helmet Noise page.

Score: The Signet-X gets a “Very Good” rating for noise control.

Intercom and Speaker Fit

The Signet-X and Quantum-X both have a design that works when fitting an intercom clamp, because there’s no fancy gasket molding around the bottom of the helmet shell.

The ear pockets are deep enough to fit speakers, but there is no specific speaker recess although there is a slight depression that can be felt under the ear pocket lining.

Arai Signet-X Rear Exhaust Vent


Yet again, the length of the chin strap padding is too short. It’s way past time for Arai to fix this problem. We’re surprised that on a new helmet designs like the Signet-X and Quantum-X, designed for street and touring, that this problem wasn’t resolved.

Safety Standards

The Signet-X meets the DOT standard in the U.S.A. and it is Snell M2015 certified. See the webBikeWorld report “ECE vs. DOT Helmet Safety Standards” for more information on the difference between DOT and Snell. Also, here is information on the Snell 2015 standard.


The Arai Signet-X is the answer for riders with “Narrow” head shapes and it brings all of the new Arai “X” features to their “Long Oval” head shape helmet, completing the triumvirate. However, you’ll pay for the privilege, as the list price starts at $679.00 and goes up from there with the various graphics and patterns.

More webBikeWorld:

wBW Product Review: Arai Signet-X
Manufacturer: Arai Helmet Ltd. List Price: $679.95 to $829.95
Colors: Solids and graphics. Made In: Japan
Sizes: XS-2XL Review Date: May 2017
Shell Sizes: 2
Rating Scale is subjective: Unacceptable, Poor, Neutral, Very Good, Excellent, Outstanding.

Note: Item provided by a retailer, distributor or manufacturer with these Terms and Conditions.


  1. I have a large oval head & have worn Aria helmets from many years. I have a xxl Signet Q hoping to replace due to use with a xxl Signet X. Tried it on & it’s not even close to fitting. The padding along the bottom sides of the helmet is too tight. There are not smaller cheek pads available. Disappointed I’ll have to change brands after 30 years. Aria please bring back a full long oval in 3 XXL as you had in the past!

  2. I have the Signet X and it is easily the most comfortable helmet I have ever owned. I wished I had figured out my head shape years ago. Now to figure out the Cardo Q Solo speaker mount. Mounting them on top of the cheek pads is not working as my ears fold and knock them loose.

  3. As you’ve noted, the fit of Arai helmets is a fairly complicated issue. As a rider with a “long oval” head shape, I’ve found Arai helmets fit me better than any other brand. The Bell RS-1 was close, but the model I bought online was damaged, and I never wore it on the bike.

    My Arai Profile felt like a custom fit, almost perfect, so I think I must be close to the “blade” shape mentioned in this review. I bought a Signet Q pro tour to get the sunshade feature, but the size M I wore in the Profile felt too loose (mostly too wide), and I wound up getting a size S with thinner liner. That gave me a secure fit, but there was a minor problem with forehead pressure that diminished over time as the helmet seemed to break in. I still wear it, but I hoped I could find a better fit.

    When I first tried on the Signet X, I actually hated it. The chin strap material on the left side of the helmet gouged that side of my head when I pulled on the helmet, and the recommended size M felt loose and sloppy. But after trying about 6 other helmet brands that just didn’t fit well enough, I came back to the Signet X.

    In a subsequent fit test, I was able to pull the helmet on without discomfort. Possibly there was a slight difference in the construction of the 2 helmets I tried. The helmet still felt too wide, but with the optional and expensive larger cheek pads, the fit seemed almost as good as my Profile. Snug and comfortably padded. Definitely better than any other brand I’d tried.

    Since I think Arai has a serious commitment to making their helmets as protective as possible, and at least offers some options for riders with different head shapes, I’m willing to pay extra for their products, although I’ve ordinarily bought an older model at a closeout price, which was still pretty expensive.

    With advancing age and injuries, I only have a few years of riding left, so I decided to pay full retail for what I hoped was the best helmet I could buy.

    In addition to the very good fit, the helmet seems more protective and functional than previous models. The slightly larger silhouette indicates a thicker EPS liner and/or shell for more impact protection. The vents are much eaiser to use and have larger openings. Due to the close fit and helmet shape, it is remarkably quiet at the speeds I reach (usually 65 and under) And finally, we can remove the plates covering the face shield mechanism so we can take off the shield without worrying about breaking something. Since Arai designed the helmet to allow the addition of the pro shade, I added that option. I chose the Focus model, and the graphics and finish make the helmet look like a work of art.

    The only complaint I have is that the latch that secures the face shield in the closed position seems to stick in the closed position and is hard to open while wearing gloves. I ordinarily leave it cracked open so I can ride without a pinlock, but when I accidentally shut it completely, it is frustrating to try to open it. I think this is the biggest design flaw in the helmet. Fortunately, it doesn’t usually create a problem for me. Still, Arai, come on. At this price level, this should not happen.

    In the final (admittedly verbose) analysis, I think I own the best helmet I can buy, based on my particular criteria. The price was almost astronomical, but since I was fortunate enough to be able to afford it, I thought it was a good decision. I’m also happy that a privately owned company like Arai, which employs craftsmen rather than robots, and prioritizes design philosophy over profit, still exists in this corporate environment, and I was willing to pay a premium to help support what is becoming an increasingly rare example of a business with some old-fashioned ideals.

  4. Update to my comment from September 2018. There are actual recesses below the ear pocket covers. My Cardo Q Solo fits perfectly.

  5. There seems to be a little confusion about shell sizes. The article says 4, but then lists 5. The specs at the end of the article says 2 shell sizes. Is there a definitive answer of how many shell sizes and which shell sizes match which helmet sizes?

  6. For my head (the only one I can definitively speak for), the Signet-Q–when I purchased it–was the only long-oval that fit properly.
    The Signet-X, I find, is definitively less long-oval and more toward “medium-oval.”
    Even worse, Arai changed their sizing. I am a small in most helmets, and the Signet-Q in small fit, and continues to fit with the new, Eco-Pure replacement pads, perfectly.
    The Signet-X size small, however, is too large, and the extra small is too small.
    I have spoken with others who report the same problem–and one of Arai’s larger US dealers said those shared subjective experiences were not just subjective.
    They confirmed there were measurable differences between the Q and the X that matched the subjective reports.
    The problem, therefore (at least with respect to the Arai’s changed fit) is less about what is in my head, and more what is on it.

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