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  • Kask Protone Helmet
  • Kask Protone Helmet
  • Kask Protone Helmet
  • Kask Protone Helmet
  • Kask Protone Helmet
  • Kask Protone Helmet
  • Kask Protone Helmet
  • Kask Protone Helmet
  • Kask Protone Helmet
  • Kask Protone Helmet
  • Kask Protone Helmet
  • Kask Protone Helmet
  • Kask Protone Helmet
  • Kask Protone Helmet
  • Kask Protone Helmet
  • Kask Protone Helmet
  • Kask Protone Helmet
  • Kask Protone Helmet
  • Kask Protone Helmet
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  • Kask Protone Helmet 3/4 Back
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KaskProtone Helmet
Sale $185.06 - $299.95

Item # KSK000I

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  • White2/Light Blue, S ($211.71)
  • White2/Light Blue, M ($211.71)
  • White2/Light Blue, L ($299.95)
  • White1, S ($246.17)
  • White1, M ($246.17)
  • White1, L ($246.17)
  • White/Red, S ($226.23)
  • White/Red, M ($226.23)
  • White/Red, L ($226.23)
  • White/Navy Blue, S ($254.92)
  • White/Navy Blue, M ($254.92)
  • White/Navy Blue, L ($254.92)
  • White/Lime, S ($257.07)
  • White/Lime, M ($257.07)
  • White/Lime, L ($257.07)
  • Red, S ($223.68)
  • Red, L ($223.68)
  • Pink/Navy Blue, S ($226.23)
  • Pink/Navy Blue, M ($226.23)
  • Pink/Navy Blue, L ($226.23)
  • Navy Blue/Pink, S ($226.23)
  • Navy Blue/Pink, M ($226.23)
  • Navy Blue/Pink, L ($226.23)
  • Matte Black, S ($226.23)
  • Matte Black, M ($226.23)
  • Matte Black, L ($226.23)
  • Lime, S ($195.49)
  • Lime, M ($195.49)
  • Lime, L ($195.49)
  • Light Blue, M ($299.95)
  • Light Blue, L ($299.95)
  • Blue Matte, S ($299.95)
  • Blue Matte, M ($299.95)
  • Black/White, S ($186.31)
  • Black/White, M ($186.31)
  • Black/White, L ($186.31)
  • Black/Red, S ($195.49)
  • Black/Red, M ($195.49)
  • Black/Red, L ($195.49)
  • Black/Lime, S ($212.66)
  • Black/Lime, M ($212.66)
  • Black/Lime, L ($212.66)
  • Black/Blue, M ($199.99)
  • Black/Blue, L ($199.99)
  • Black/Black, S ($186.31)
  • Antracite/Lime, M ($299.95)
  • Navy Blue/White, S ($185.06)
  • Navy Blue/White, M ($185.06)
  • Navy Blue/White, L ($185.06)
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Item # KSK000I
Description

Protect your tactical engine.

While the cyclists at Team Sky are more renowned for their legs than their brains, the latter do occasionally play a significant role in cycling. Case in point is Stannard's surgical dismantling of an apparently invincible Ettix-Quickstep at Omloop. Given that cycling is often equal parts cunning and strength, the pros at Sky rely on Kask's Protone Helmet to keep their strategic organ in top shape so it can effectively direct their energies when frantic finales send all the blood rushing to the legs.

Tactical engines like Stannard's are protected by an in-mold construction of a polycarbonate shell bonded with an EPS foam body, all of which is built on a frame designed to let the helmet absorb impact while still maintaining enough structural integrity to see you safely through the duration of a crash.

While safety is a helmet's first (and usually last) job, there are certain benchmarks that today's industry expects top-end protectives to meet. The current frontrunner in this category is aerodynamics, and the Kask ran the Protone through the expected wind-tunnel paces in order to design a model that dodges the wind whether you're head-on in the drops or in virtually any other cycling posture imaginable.

The second consideration is cooling, and unlike many of its competitors, the Protone doesn't sacrifice ventilation for aerodynamics. In addition to the immediately obvious vents and rear exhaust port, the Protone incorporates Coolmax padding. Coolmax padding equates to more efficient moisture transfer and evaporation to complement your body's natural cooling process. They're also odor-resistant, removable, and contribute to the comfortable, personalized fit of the floating Octo Fit cradle and corresponding ECO Chinstrap.

  • Top your head with the helmet that tops Tour podiums
  • In-Mold shell increases structural integrity
  • Aerodynamically verified in ye olde wind tunnel
  • Adjustable cradle keeps your tactical muscle secure
  • Ventilation channels to encourage air flow and keep you dry
  • Anti-odor padding will fend off stink for way longer than 21 days
Tech SpecsSize
Tech Specs
Shell Material
polycarbonate
Impact Foam
EPS foam
Fit Adjustment
Octo Fit
Visor
no
Certifications
CE EN 1078, CPSC 1203, AS/NZS 2063
Recommended Use
road, cyclocross
Manufacturer Warranty
limited lifetime
Size

Kask

Helmets
Vertigo, K50 EVO, K50 MTB
 ML
Head Circumference

18.9 - 22.8in

(48 - 58cm)

23.2 - 24.4in

(59 - 62cm)

K10 MTB, K31 Crono, K10 Race
 One Size
Head Circumference

20.9 - 24in

(53 - 61cm)

How to Measure:
Measure around your head where your hat would fit comfortably.

Reviews & Community

REVIEWS

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I am still alive today. Thx to PROTONE!

  • Familiarity: I've used it several times
  • Fit: True to size

About 2 months ago, I was hit by a car while riding my bike. The car had been traveling at 50 mph, and the driver never applied his brakes. According to witnesses I was thrown 50 feet before ending up in a ditch. I still have amnesia for the period of time that immediately followed the accident. The doctors were amazed, said it was a miracle I was still alive, or did not have any serious injuries. The doctors also said that my helmet saved my life. I was wearing the Kask PROTONE, which only had 2 tiny, and very superficial cracks, despite the immense impact. Subsequently, I bought the Kask Mojito to replace the PROTONE, just because of the cost. But will be buying another PROTONE soon. Cannot recommend it enough!

On a different issue, the cooling is amazing. I sweat a lot, and most of my hair would still be quite dry after a 4-5 hour ride wearing the Protone. Incredible product!

Fariha

Avg. ride time: 5h 57m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Strange design for tightening system.

  • Familiarity: I returned this product before using it
  • Fit: True to size
  • Size Bought: medium

They have some strange floating ratchet system for holding the retention device in the back of the helmet.

This allows for the retention system to float a bit as your head moves. This is irritating and doesn't make any sense to me.

Helmet also came with very lame and cheap decals.

Otherwise very cool looking and fit me pretty well.

Thank goodness no MIPS.

The fit!!

  • Familiarity: I've put it through the wringer
  • Fit: True to size
  • Size Bought: Large

Picked up a Kask Protone and have been using it for a couple of months now, cannot say enough good about this helmet. The fit is fantastic, I even find myself checking occasionally to see if I remembered to put my helmet on before leaving for a ride. I also like that it looks unique, it doesn't look like really anything else on the market and it doesn't look like a mushroom on my head.

5 stars!

Avg. ride time: 4h 19m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Girlfriend loves it

  • Familiarity: I've put it through the wringer
  • Fit: True to size

Bought for girlfriend and she loves it. Has about 3000 miles on it now with no complaints.
Weight is good
Straps lay fat
Adjustment is nice
Temperature is good... no complaints!

Saved my life

  • Familiarity: I've put it through the wringer
  • Fit: True to size
  • Size Bought: Medium

First off, I loved the helmet...light, cool, and looks good...sizing and fit was perfect. Then, it saved my life on a crash...took a good beating off the roadway and kept the noggin in tact...not even a concussion....can’t say the same for the skin on my shoulder and hip...will be ordering another to get back out on there!

Saved my life

Weight significantly higher than claimed

  • Familiarity: I returned this product before using it
  • Fit: True to size

I am a multi-decade avid cyclist and a bit of a weight weenie. Been waiting for the Protone to show up in small ever since it came on the market. I ride in the Southeast hot and humid. Like the concept I could get a light helmet with decent ventilation and Aero properties to boot. Also loved the aesthetics matching my Dogma and kit nicely. Claimed weight on Kask site is 215gr and on CC site at 230gr in medium. Turns out when I received my small it weighed in on my Feedback scale at 278gr. I thought the scale must be broken. It also felt heavy when I put it on versus my current S-works helmet. Decided to return the Protone (love how easy CC makes this process) and buy the Giro Aeon. Aeon claimed weight is 211gr and came in on my scale at 213gr. I am usually skeptical of claimed weights but, Kask has taken it to a new level. Very disappointing.

Thanks for the review Kevin! Glad that you ended up with the right helmet in the end.

Avg. ride time: 1h 59m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

It Fits!

  • Familiarity: I've used it several times
  • Fit: True to size

I've sold these helmets for years now and I rarely come across a rider who the Protone will not fit. When you pay for a $299 helmet you're not necessarily getting any greater safety benefits, you're paying for the fit. Kask delivers a strong all-around helmet - perfect for racing, cruising and everything in between. Aero enough for the budget-conscious triathlete and breathable enough for the climber pushing maximum effort.

I wear a 59-62cm (LG) in just about every helmet and the Protone is no exception.

Wide heads rejoice!

  • Familiarity: I've put it through the wringer
  • Fit: True to size
  • Size Bought: Large

This is the only helmet that fits my wide head. I've tried on countless helmets, but nothing fits like the Protone. It's an expensive helmet, but not having to experience pressure buildup around the temple is worth every penny. Plus, I'd say it's one of the best looking helmets out there. What's not to like?

El mejor y mas bonito casco del momento

  • Familiarity: I've used it several times
  • Fit: True to size
  • Size Bought: M

Super comodo, super chevere, muy ajustable y super fashion, con Oakleys Jawbreakers

Avg. ride time: 5h 21m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Pro-level Brain Bucket.

  • Familiarity: I've used it several times
  • Fit: Runs small

The overall quality of this Kask helmets is great. It is light, vents well, and looks fantastic.

The fit adjustment offers a large range of adjustments the leather chin strap is super comfortable. I use this helmet for road and CX.

Looks and Safety

  • Familiarity: I've used it several times
  • Fit: True to size
  • Size Bought: small/medium

The moment you pull this helmet out of the box, you see and feel the quality that Kask has put into it. The overall quality is superb, and the weight is quite minimal.

I primarily use this for the road, and it has worked out great! I decided to try it on a recent mountain bike ride and it did well on the flats and climbs, but going down hill something changed and I had this pain digging in on the back off my head where it grips and keeps the helmet in position. I eventually had to stop and see what was going on, and couldn't do anything other then open up the dial for the remainder of the descent. If you're buying this for the road it performed flawlessly, and on the mountain, I will actually stick with the helmet that has been my normal go-to.

Questions about Kask or other helmets, please reach out.

Looks and Safety

Literally, The best

    Purchased for a friend, here's what he had to say about this helmet!
    Best helmet I have ever owned. I’ve ridden Laser, Giro, and others, and this thing is by far the best. The style is impeccable, and distinctly “Euro.” From there, the venting is great. My favorite feature is the leather chin strap, which is super super comfortable on a long ride, particularly compared to normal nylon that ends up caked in salt/sweat and chaffing. One note: I bought the normal black (glossy), but after seeing some matte black Kasks on the road I would probably have gone with the matte if I could do it again.

    Safest, Most Comfortable Helmet Around

    • Familiarity: I've put it through the wringer

    This helmet all but saved my life during a crash this past weekend. I took a spill at just shy of 35mph going downhill on my TT bike and knocked my head pretty hard on the pavement.

    Aside from being very fortunate to only have road rash and no breaks, this helmet prevented any head injury whatsoever - no cracks, concussions, scratches, etc.

    I can't guarantee no one would sustain further injuries but I can't say enough about my confidence in the safety of this helmet.

    It's wicked comfortable to boot! Super adjustable and the leather chin strap is a lot more comfortable than you may think.

    Even if there is no sale on the helmet, $300 is a small price to pay for the safety and comfort of this helmet.

    Poor Build Quality

    • Familiarity: I've put it through the wringer
    • Fit: True to size

    When I received it in March 2017 I loved it. It fit well, it vented well and it was really light! All essential qualities for long rides in hot and humid Singapore.

    What I didn't like was realizing that those soft inserts of those two rear paddles/supports (the ones where the straps go through) at the back of your head had started to fall out! C'mon, this is an expensive piece of kit and to have bits falling off? Not cool.

    Needless to say this is the last time I am buying a KASK.

    Avg. ride time: 2h 4m per week
    • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

    Great aero at angles

    • Familiarity: I've used it several times

    Great fit after a little breakin (pads felt a little weird at first). At speed I was pleasantly surprised at this feeling dramatically more aero at angles than any other helmet I've used (Giro and Bell). In other words, you can turn your head left/right and not feel wind tug.

    I've used a number of helmets over the years, and so far this is my favorite by far.

    BIG

      Contrary to numerous reviews that I have seen and which I based my purchase, this helmet is not low profile, streamlined (sic), etc. I purchased large (59 cm) because I was at the very high end of medium. The helmet adjusted just fine but the size of the helmet made me feel as if I had a 2-3 gallon bucket on my head. I have Garneau and Giro helmets that I compared to the Protone . They are considerably more 'sleek' and have ample protection.

      Great helmet

      • Fit: True to size

      It's got a great look, aero, and still well ventilated. I think the front padding is lacking, as compared to the Kask Mojito. Only caveat is that if you have glasses with long arms, then it may run into the helmet and not site well. I have the Oakley jawbreakers with the shorter arms and don't have this problem, but some of my buddies who have the same helmet have complained about this.

      Glasses upside down is typically the way you're suppose to put them. Most helmets are designed that way..

      This helmet is everything

      • Familiarity: I've put it through the wringer

      All aspects of this helmet are on point. The price point matches the quality you'll be receiving. So so light and fits great. Little details like the Coolmax in it make all the difference.