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Arai Defiant Base Helmet
  • Arai Defiant Base Helmet - Frost Black/White
  • Arai Defiant Base Helmet - Frost Black/White
  • Arai Defiant Base Helmet - Frost Black/Orange
  • Arai Defiant Base Helmet - Frost Black/Orange

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Video Reviews (4)

Arai Defiant Base Helmet Videos

Arai Defiant Base Helmet

Designed specifically for the aesthetics and needs of street fighter and naked bike rider in mind, the new Arai Defiant Base is equally aggressive and feature rich, as one would expect from a new Arai helmet. Based on the fit and comfort of the Quantum, the Defiant was built for the upright riding position with its aggressive, integrated chin spoiler, which was designed specifically to guide wind around the neck and to improve the aerodynamic properties of the helmet. The Hyper Ridge Bumper circles the bottom of the shell both adding additional strength and also lowering the helmet's center of gravity, while flaring the helmet opening slightly to increase the ease of putting on, and taking off.

The Arai Defiant utilizes Arai's latest faceshield design, the SAI Max Vision Pinlock Shield with Brow Vents and includes Pinlock insert lens. The SAI Max Vision shield has been widened by 5mm left and right and offers one of the widest eyeports available for excellent peripheral vision.  


  • Aggressive new styling
  • Internals are redesigned with a focus on safety and comfort
  • Organic shell shape for superb energy management
  • New IC-4 Upper Intake vents seal more completely when closed
  • New ACR-4 flow thru exhaust vent allows greater air flow when open and reduces drag when closed
  • FCS R (Facial Contour Support) cheek pad design has 5mm peel away micro fit layer for greater personal fit
  • Cheek pads feature contoured shape, multiple density foam layer supported by a patented spring
  • New shell shape is easier to put on and take off
  • New water repellent material along bottom edge
  • Pull down spoiler works with new flared bottom to increase helmet stability
  • SAI Max Vision® Brow Vent Pinlock anti-fog lens insert included
  • DOT and Snell 2010 certified
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Arai Defiant Base Helmet 4.6 5 80 80
Arai Helmet Third time's a charm. I guess my head has grown. After ordering an XL, then a 2XL, I finally found a 3XL that fits my noggin. Great helmet, fits perfectly (finally). Highly recommend. May 18, 2015
Know What This Helmet is Good For...and not! Bottom line right up front: I think this is the best possible helmet you can buy for very hot weather. If you have a 'helmet collection' it would be a perfect niche helmet to add. If you are looking for an all season, all around helmet, I think there are much better choices. What this helmet is great for: * this thing ventilates like MAD! When it's a hot day, this is the only go-to helmet for staying cool. Check it out: eyebrow vents, 2 slider vents on top, an ENORMOUS vent right in front below the shield, another huge slider vent in back, plus an air exhaust port at the bottom of the helmet. * Great wide vision, and it's really fun to try out different Arai custom color face shields or change them out for different conditions. I like the mirror the best, personally. * For a large size helmet, it is very comfortable and super lightweight. It feels like nothing on your head....awesome. And it fits well. * Arai reputation for safety makes you feel secure. Plus there are always a lot of great designs for Arai helmets. Also Arai makes their helmet very 'serviceable' -- spare parts are readily available such as extra cheek pads in different sizes, etc. Now for the drawbacks: * 3 great big logos ....a bit much perhaps, even for brand fans. * The chin strap is old school webbing and D-ring...no soft nice comfy non-scratchy material (like Schuberth). * This helmet is quite large. I have the Medium and it's much wider and taller than a Shoei or Shuberth C3Pro. (It's the only one that won't fit in my top box). I realize that the dimension is probably due to Arai's safety commitment, and it's light and comfortable, and looks good. It's just BIG. * Now for the biggest issue: I figured out why this helmet is so very loud on the highway. I didn't really notice it too much on side streets but my first time on the freeway, it was so noisy that I actually exited to take it off and put in my earplugs. This helmet is designed with no 'curtain' (if that's the right word) which other helmets typically have just below the chin. Usually this piece can be removed for hot weather, at the expense of some increased noise, but with the Defiant, it's just not there. The good thing is that this only contributes to the amazing air flow of this helmet, which you'll appreciate in hot weather. the bad news is that when you need it to seal up (a chilly morning, or going on a longer highway trip) you may miss having that piece seal up the bottom of your helmet. So in summary, this is a terrific hot weather helmet, but I don't think it has the flexibility to be your go-to all year lid. May 17, 2015
Great air flow and quIet Riding at speeds greater than 75 mph, it's quiet and stable riding in an upright position. Great air flow and it's comfortable wearing it in 80 plus temps. I have the clear pin lock shield and use sunglasses without any pressure at the temples. It does tend to fog up early mornings with glasses - just kick up the speed and it clears up nicely. Well worth every penny spent. June 23, 2015
Great helmet This helmet is prefect for the naked bike. Does a great good at speed keeping your head in place. June 22, 2015
Great fit and finish I have an Arai head I don't look at other helmets Great fit and comfort with top notch protection Expensive, but it protects your head. April 9, 2015
Wow, what a great lid I've always loved Arai so I'm nothing like an objective, unbiased reviewer. I recently picked up a Signet Q based on what I *thought* was my head shape - apparently Arai and I disagree on the definition of long oval, which I've been seeing a lot of on other Signet reviews. A local shop custom-fitted a Defiant for me and the difference between it and the Signet was night and day. Spirited (ahem) riding on my R1100RT with the windshield fully down was blissfully smooth and quiet (but I do recommend good foam earplugs with any lid), great airflow, excellent visibility, and the most comfortable padding I've ever felt aside from my beloved old Quantum. Simply the best helmet I've ever owned in 20+ years of riding, period. May 17, 2015
Very Impressive Helmet My previous helmet was an Arai Vector. It was about 5 years old and it was time to upgrade. I immediately noticed the improved ergonomics on the Defiant. The padding is more compliant, the field of view is improved, there is more room for my ears, and it is so much easier to put glasses on while wearing this helmet. I was one of the many people who was wearing the wrong size helmet. I went from an Extra Large to a Large. I spent a great deal of time researching helmets and the Revzilla video reviews had the best information. I went to two shops to try on helmets and they both fit me with an Extra Large again. Neither place used a tape to measure my head. The videos on fitment were much more helpful than the people in the shops. I have a few hundred miles on this helmet now, and it is breaking in nicely. It still feels a little tight, but the area around the top of my head now fits much more solidly in the helmet. For safety and long term comfort this is essential. I'm very happy with this purchase. I ordered the helmet on a Monday about 10:00 AM, it was at my door the next day before noon. That's Amazing! I would not hesitate to purchase another helmet from Revzilla. April 30, 2015
Not a bad helmet for safety and noise, terrible styling This was my first helmet in several years. Came highly rated and I was looking forward to it. Not a bad helmet all in all. Very safe and some decent features. Extremely quiet. Good for keeping down fog. The fit is true to size. But the styling is terrible. It wasn't long until I realized I looked like a Lego man. The thing is just a big cylinder. If you're not concerned with looks at all, I highly recommend this helmet. I just put this thing to bed though after a year, in favor of an AGV. The AGV is less durable and noisy, but is safe, has great features and just looks sick. April 28, 2015
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Have a functionality, fit, or otherwise product-specific question about the Arai Defiant Base Helmet? Ask it here! If you have a customer service or shipping question, please direct it to our Customer Service department.

Arai Defiant Base Helmet
Already Asked: 11 Questions, 50 Answers
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RevZilla Store asked: Why did you choose this?
Shana P: I own a naked bike, I have an oval shaped noggin', and I prefer Arai helmets. Jun 28, 2015
steven s: Arai fit/finish
Also like the classic graphic
Apr 14, 2015
R A: Best fit for my head shape, best head protection, great ventilation for hot summer days in TX, and looks sharp with my BMW RNineT. Feb 16, 2015
Douglas B: I bought a 1290 Super Duke R, I have an old Yamaha SR500E and a Big Ruckus. So my Shoei X-12 is a little wrong for that, plus it is older, so I wanted a new helmet and I have enjoyed Arai in the past. The videos on your site were very helpful as well. Jul 17, 2014
Kevin N: Designed for naked bikes with the 3/4 or full upright position. I ride a Diavel Carbon, so it seems a perfect fit! Jun 17, 2014
matthew l: returned due to fit May 8, 2014
David W: I ride a triumph Speed Triple bike and determined this was the best Arai helmet for upright sportbike riding. Apr 17, 2014
John F: Designed specifically for non-faired naked bikes. Oct 30, 2013
Janet F: Thank heavens Arai offers XXXL again! Great venting. Pinlock standard - woo hoo! (Glenn) Oct 12, 2013
John R asked: Hey All, I am right in the middle of a Medium and a Large at 23in head measurement. Whould you recommend I go the larger or smaller route? Thanks... Apr 21, 2014
Answer this · Send to friends Good question? Yes (2) No (0)
Christopher L: Revzillas size guarantee (read details) allows you to make sure you get the right fitment. BUT if you don't want to try one and then the other thru Zilla I'd suggest going somewhere local that has them for you try on, if possible. You may find neither fit you quite right and may need to order the smaller shell w the larger helmet size's cheek pad set, which may become costly. However, It's crucial to keep trying on a helmet and ensure fitment is comfortable. Keep in mind a very slight break in will occur and will very nominally loosen up as the foam forms to your head. Apr 21, 2014
Reply to Christopher Good answer? Yes (0) No (0)
RYAN K: we were in the same spot and went with the larger size we went the right way!
only thing I will say is this helment is a little larger then most on the diameter around chin. love the helment but bigger size seems to give more sticking out in front then most. would we buy again probably so.
Apr 21, 2014
Reply to RYAN Good answer? Yes (0) No (0)
Noah D: I just got this helmet and would tell you normally to go smaller but in this case go up to large. I measure 23-1/2 and the large was too tight. XL was nice and snug. Perfect actually. You will love the helmet! Apr 21, 2014
Reply to Noah Good answer? Yes (0) No (0)
Earl S: Thanks for this piece in info. I measure 23 1/4 and I tried a Large RX-Q and it was too tight as well. I haven't tried the Defiant yet but I assume it will be similar. I'll have to try it locally before I buy from RZ. Jul 11, 2014
John F: I'd go smaller. Padding will loosen up. And you don't want it to be too loose. I think a little tighter is better than a little looser. Apr 21, 2014
Reply to John Good answer? Yes (0) No (0)
John R: I had a vector , I believe that was a medium but can't remember. Are the shell different from a Med' to a Lrg'? Apr 21, 2014
John F: Sorry don't know. Last year I bought a shoei RF 1100 and after a couple months it felt too loose. So I went a hair smaller on the Defiant and I'm glad I did. Jus make sure the top inside head cage isn't causing any pressure hotspots on your forehead. Apr 21, 2014
Timothy B: I was in between a L and a XL and I chose the Large. XL would have been too big Apr 21, 2014
Reply to Timothy Good answer? Yes (0) No (0)
A shopper asked: I ride a harley davidson dyna street bob and wondering what is the best type of helmet for riding that type of bike. the helmet I am using now pushes my head all over the place and on long rides iI end up with a sore neck and headache? Aug 15, 2014
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Christopher L: I own this helmet and have used it on three bikes: a CBR (sport bike that I can full tuck in), a Z1000 (naked bike with LOTS of direct wind) and a Goldwing F6B w a tall windshield. I wouldn't say there's excessive turbulence with the Z or the CBR but on the Goldwing, were there was very little direct wind and a "pocket" of turbulence around my head I did feel some movement I hadn't been used to. That being said, when I did put roughly 600 miles on the Goldwing within the 3 days I rode I would NEVER have complained about any soreness from the movement. It's a fairly light helmet but the BIGGEST advantage of this helmet over ANY helmet is the direct ventilation it provides. The biggest disadvantage is how noisy it is. Lots of wind rushing around the shield pods on the side and the vents themself. Hope this helps. But it just MAY complicate it more for you hahaha either way. Be assured that arai is a world class helmet w great quality. Aug 15, 2014
Reply to Christopher Good answer? Yes (0) No (0)
Larell A: I ride a naked bike that has an upright riding position (KTM 950 SM-R). I've noticed that the Defiant vents really well and doesn't catch the wind at all when I look over my shoulder. It's pretty aerodynamic. I've ridden in torrential downpours and I stay dry and 100% fog free with the visor closed. My only complaint is that it's a little noisy with all of those vents. Also, my Sena SMH-10 doesn't fit well on it at all. Sadly, I crashed in it back in February. I hit the ground doing about 60 MPH but sustained no head or neck injuries...the helmet really held up well. I will definitely buy this helmet again. Aug 18, 2014
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Michael S: I ride a harley 883 iron and was having the same problem with my helmet. I bought the arai defiant helmet a few months ago and love it. The air flows much better in the helmet and I find it is much more comfortable than my previous helmet. Aug 15, 2014
Reply to Michael Good answer? Yes (0) No (0)
John F: Not sure what's best for a cruiser style as mine is a street fighter. But I can tell you that the helmet is very stable for me. Do you have something that cuts the wind like a windshield or fly screen? Aug 15, 2014
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RYAN K: We use our helmet for flat track competition its not been used for rides such as your asking about. For what we use it for it is a nice helmet. Aug 16, 2014
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Ajay Q asked: i am in the final stage of buying my first bike it is a ZX10R is this the right helmet to buy for the type of riding on a supersport bike ?? Oct 5, 2014
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Corey G: I bought the helmet for it's great ventilation and naked bike aerodynamics in mind. I would recommend this as it has proven itself quite versatile from sport bikes to adventure bikes. Oct 5, 2014
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Ajay Q: Cheers! Oct 5, 2014
Timothy B: Yes, I use mine with my GSXR 1000. If you go on long rides I would use earplugs. Oct 5, 2014
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Ajay Q: how would you chose between the Arai and the Shoei X-12 ? Oct 5, 2014
Timothy B: I went to a local BMW bike shop and tried on several helmets. Some will fit your head shape better than others. Oct 5, 2014
Ajay Q: Thank you again. Arai it is for it fits perfectly fine. IN the Shoei I didn't feel 100% comfortable i had few pressur points. Oct 5, 2014
Michael L: I like this helmet more than any I've owned. Have gsxr1000 and Ducati, and st Oct 6, 2014
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Ajay Q: Thank you very much for the answer! Oct 5, 2014
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Thomas Ryan D asked: Long time Arai owner here; Corsair RX, Quantum 2 and XD4. I love them all. I now need a proper lid to compliment my Ducati Streetfighter 848. My intended use will be mostly street, but this helmet will also see two or three track days every season, so it needs to be capable of both.

The Defiant will be more than adequate for the street, no doubt. I'm curious about how it performs on the track, under high speed, etc.? For reference, the helmet in consideration is the RX-Q. For those of you that have taken the Defiant to the track, can you please chime in?
Jan 20, 2015
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cheryl c: this is my wife's helmet and she is just a passenger on the street. This is her 3rd arai and she likes it best of all. very light and great field of vision. it also flows air better than all the previous. Jan 21, 2015
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Thomas Ryan D: Thanks for the feedback! Jan 21, 2015
A shopper asked: I have seen your videos on both the Defiant vs RX-Q. I ride a F800R. Im leaning more towards the Defiant becuase of looks but stacked up against the RX-Q , aside from style, any diferences to point out that can help me clairfy my purchase? My commute is 20 miles but through NYC Apr 24, 2013
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Christopher L: I've done quite a bit of research on both products. It seems the Defiant is far superior in terms of design. It's not just "style." It's the function of that style: the adjustable chin curtain to keep excess wind out (might be especially useful on colder days with your naked); the "diffuser"/spoiler @ the base of the helmet for increased stability and noise/turbulence reduction; HEAVY ventilation (possibly the best Arai has to offer...yes, including the Corsair V) due to the monstrous chin ventilation system (three stage: closed, partial open, full open); and from what I can tell, it looks like the vent controls would be easier to control with gloves on.

Bottom line: I have a 2010 Z1000 (nearly 20,000 miles) and a 2007 CBR 600RR with 56,000 miles on it. ALL these miles have been put on with a Shark RSR2 (thick visor, decent ventilation, awesome looks w/the Duhamel white graphic I got, PERFECT fit and comfort, easy visor swap, etc. etc.) I love the Shark and will be having a real hard time finding its replacement. I'm tedious in my research and after fitting many models (haven't fit on a Defiant) and reading about ALL top-line models it's come down to these (for me): Schuberth SR1 and Arai Defiant. The fit for the Defiant is hopefully identical to the RX-Q (which fit me better than a CorsairV) which is the shell it's based off of. Haven't fit on an SR1 but from what I can read, it's "race" fit is superb. Good luck with your decision. Just remember, when dealing with the top-line model of almost anything, you're not going to make a bad choice, it's just that one will be wiser for you than the others. Just figure out which one.
May 27, 2013
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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
Frost Black/White / 2XS 886203 818829 In Stock: Ships within 24 hours
Frost Black/White / XS 886204 818830 In Stock: Ships within 24 hours
Frost Black/White / SM 886205 818831 In Stock: Ships within 24 hours
Frost Black/White / MD 886206 818832 In Stock: Ships within 24 hours
Frost Black/White / LG 886207 818833 In Stock: Ships within 24 hours
Frost Black/White / XL 886208 818834 In Stock: Ships within 24 hours
Frost Black/White / 2XL 886209 818835 In Stock: Ships within 24 hours
Frost Black/White / 3XL 886210 818836 In Stock: Ships within 24 hours
Frost Black/Orange / 2XS 886195 818819 Out of Stock
Frost Black/Orange / XS 886196 818820 In Stock: Ships within 24 hours
Frost Black/Orange / SM 886197 818821 In Stock: Ships within 24 hours
Frost Black/Orange / MD 886198 818822 In Stock: Ships within 24 hours
Frost Black/Orange / LG 886199 818823 In Stock: Ships within 24 hours
Frost Black/Orange / XL 886200 818824 In Stock: Ships within 24 hours
Frost Black/Orange / 2XL 886201 818825 In Stock: Ships within 24 hours
Frost Black/Orange / 3XL 886202 818826 In Stock: Ships within 24 hours