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KaskProtone Helmet


Item # KSK000I

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Item # KSK000I

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

California Proposition 65


This product can expose you to chemicals including Bisphenol A (BPA), which is known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov.

Tech SpecsSize
Tech Specs
Shell Material
Impact Foam
EPS foam
Fit Adjustment
Octo Fit
CE EN 1078, CPSC 1203, AS/NZS 2063
Recommended Use
road, cyclocross
Manufacturer Warranty
limited lifetime


Mojito X, Mojito X Peak
Head Circumference

18.1 - 22in

(48 - 56cm)

20.5 - 22.4in

(52 - 58cm)

23.2 - 24.4in

(59 - 62cm)

24.8 - 25.2in

(63 - 64cm)

Infinity, Protone, Rex, Rapido, Valegro, Utopia, Caipi
Head Circumference

19.7 - 22in

(50 - 56cm)

20.5 - 22.4in

(52 - 58cm)

23.2 - 24.4in

(59 - 62cm)

Bambino Pro
Head Circumference

21.7 - 22.4in

(55 - 58cm)

23.2 - 24.4in

(59 - 62cm)

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

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Nice There’s better options

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

This is a nice helmet however it only comes with one set of padding, no replacements. I like to take out my sweaty pads, clean and use fresh ones while the others rest and dry. The pads for this helmet are not on,y difficult to find, when you do find then there stupid expensive. I now moved to Oakleys Aro3 which is more comfortable and for me simply better, all the way around.

Be careful when purchasing

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

First, nice helmet I’ve used it on several road rides. Nice ventilation and not too noisy at speed. My big complaint is replacement pads are almost impossible to find. I contacted Kask directly and they sent me a link where the price is 22 dollars plus tax plus shipping. So basically 30 dollars for a few grams of pads. Complete BS. I’ll never buy another Kask helmet because of this. BTW, I’ve asked Competitive Cyclists about these and they’ll sell you the helmet but don’t have the pads

I love this helmet but have the same problem with one of the pads in the back. Can you share that link so I can get frustrated as well?

i have found them at bikebling.com for 22.00 bucks

Kask nailed it!

  • Familiarity: I've used it once or twice and have initial impressions
  • Fit: True to size

I didn't realize just how ill-fitting my old Giro Ionos helmet was until I upgraded it with the Kask Protone. Perhaps my head is shaped better for the Kask, but the fit and comfort is simply stellar. The Protone hugs my head perfectly and the ability to micro-adjust the fit is fabulous. I had not realized you could adjust the up-and-down positioning of the adjustment system to the correct contact point of the occipital bone - pretty slick. The soft leather-like chin strap is also a plus, as well as moving the buckle away from the traditional under-neck area. The padding is also extremely comfortable. Wind noise also seems to be reduced over my old Giro which aids in hearing upcoming traffic better. The Protone also seems to sit lower on the head which gives it a sense of more well-rounded protection, rather than a mushroom cap feeling.

The only negative is that the retention system interferes ever-so slightly with the tips of my Oakley RadarLock glasses. Not enough to make the helmet unusable, but a little adjusting is required to make everything work together.

I have a 59cm head, which is on the lower end of a Kask large, but with plenty of adjustment room, and I'll be able to wear a cap in colder conditions without issue.

Top-quality road helmet

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

Super light weight, great adjustability, comfortable padding, generous ventilation. I don't know about the aerodynamics, but if wind noise is any indication, it is much more aero than my previous helmet (Kask Mojito). Highly recommended.

Great quality and fit.

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

This is a great helmet. It’s got a very comfortable fit without too much bulk. The venting is superb. I never felt hot in this helmet. Even in the most hottest summer days. I appreciate it’s lightweight. Once it’s on you’ll forget it’s there. Hugs the head and keeps in place with a light turn of the rear adjuster. The padding is super comfortable and well thought out. Not cheap or flimsy like so many others. The faux leather strap is superbly comfortable. Not bulky but soft and easy on the skin. I got the matte black and it looks really sharp. Quality product and comes with an equally nice storage bag that you can strap over your back or shoulder.

Head Mounted Dribble Cup

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

The Protone caught more than a few sets of eyes when it was first unveiled. And it has lived a fairly long life for a single iteration of helmet, helped in part by the fact that Team INEOS (ne, Team Sky) continues to sport the lid year after year. Well, it caught my eye not long ago, too, when I found myself in the market for a helmet again. So I got it. I like the compact shape (it doesn’t make me look like a mushroom). I like the balance between aero and vented design (tasteful). And there’s one simple ingenuity that really gets me feeling warm and cozy about Kask: it’s that pleather or naugahyde chin strap the company adds to avoid salt encrusted nylon webbing from rubbing the neck raw. What a simple but beautiful design detail. Somebody was thinking … logically, helpfully, and with the rider’s best interests in mind. I think of photosynthesis, the invention of the ball bearing, or Benjamin Franklin hanging a key from a kite in a thunderstorm. Good, wholesome stuff to have with us. And so I really have only one bone of contention about the helmet.

There are engineers out there fueling the industry with bold plans on how to implement the next cog, for stepping up the performance of battery powered shifters, and creating apps for your smart phone that allow you to arrange the buttons on your levers just to your liking. Beautiful actors will demonstrate how badly you need these in your cycling routine. And yet, the bicycle persists as chiefly a mechanical device, and enjoyed by us all tremendously for the fact. Aside from that, it’s the naugahyde chin strap that really makes you happy on your twenty-five mile burner after work. First and foremost, there’s the riding of the bike, and then the little improvements along the way. Now what Kask needs to do is invent a soft gutter system that can be embedded in the foam pad that hugs your forehead when the helmet is on and cinched down. Really, why hasn’t someone figured out a way to channel sweat away from your brow and down your temples? I saw a shot of Sagan in the Tour de Suisse this year sitting up in his saddle and spraying down the lenses of his sunglasses with his water bottle, and I felt a kindred spirit. The Protone just dumps it right beside the bridge of your nose, and soon enough you’ve got a river of brine flowing across your field of vision. Kask, please make this new sweat diverting invention for the padded inserts backward compatible so that I can get it for my Protone.

There are some elite cycling apparel companies that just now are touting proprietary designs in men’s bibs that introduce a pocket-like feature in the chamois that gives your bits resting room up front without compressing them with an unforgiving lycra panel. Duh! It could have been done decades ago. But those companies feel it necessary to introduce the design as though they were leading some kind of brilliant revolution in fit and comfort. Meanwhile, Kask quietly introduces a simple chin strap that makes it more comfortable to wear your helmet. I hope they do the same, in the same fashion, sometime soon for a dribble proof foam head band in their helmets. That will be a revolution.

As for the flimsy plastic cradle pieces in the back that some reviewers have experienced breaking after time, mine are still intact after several months. Touch wood. They are flimsy. But still doing their job.

Great helmet!

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

It was time for a new helmet and after some research and reading reviews, and trying on several brands and models, I landed on the Kask Protone. Great fit, aero, and plenty of ventilation. I would recommend this helmet to anyone looking for quality aero road helmet.

Great Helmet!

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

This helmet looks good, feels good and is spot on for fit! Very well made, quality product. Easy to adjust, nice storage bag. This could be the best helmet I’ve ever had!

Strange sizing

  • Familiarity: I've used it once or twice and have initial impressions
  • Fit: Runs small
  • Size Bought: Large (after Medium was too small)

Have been using Giro and Bell helmets forever, but wanted to try these lovely Italians. All OK but the sizing is weird and seems to be biased to narrow heads. The medium was always OK with me with Bell and Giro, but (after returning the Medium) I had to use the Large in KASK, which looks sort of funny on my head. Overall great looking and airy, but strange sizing and feel.

Best helmet

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

Light, fits snug.. Not like a army helmet. I think the Protone is the best helmet in the market. Great quality straps, tightening on the back. Used over one year and still love the style and fit. It has removable pads for washing.

Color is off compared to pic

  • Familiarity: I've used it once or twice and have initial impressions
  • Fit: True to size

Helmet fits great and looks awesome but the pic definitely has it looking more grey than anthracite. Welp it is indeed dark grey...or "anthracite". I was really excited to get the helmet but a little disappointed when it turned out so dark. Keeping it. Gonna rock-it...but dang.

great fit and comfortable

  • Familiarity: I've used it once or twice and have initial impressions
  • Fit: True to size

I've owned almost every single helmet brand... so far this fit my head the best. on Giro and Specialized, i have some in M and some in L (kinda in between). This one is perfect on L

1s Impression

  • Familiarity: I've used it once or twice and have initial impressions
  • Size Bought: Medium

Sizing is spot on for this helmet. In a Giro Synthe I am on the outer limit of their size medium and this Protone Medium fits exactly the same. Compared to my Synthe(which I like very much), this helmet is just a slight notch above. The finishing and styling is just better than any other brands premium offerings and that "eco leather" chin strap is so comfy. If you have experience with premium lids from various other brands like I do, and want something just a slight notch above the best, grab this helmet. As long as fit and feel works for you(fit is very personal) you will not find a more premium road lid out there.

Sizing issue, used item, and pricing

  • Familiarity: I returned this product before using it
  • Fit: Runs small

Helmet itself is great quality. Issues are more with Competitive Cyclist:
1. Size up if you're near the limit of the size guide. I measured within medium using the size guide provided here--too small to get on.
2. The item I received had clearly been opened before - helmet wasn't properly seated in the box and no manuals or Kask swag that I could see. Not a huge deal for something like a helmet, but disappointing in conjunction with the other issues.
3. The CC 50%+ off sale price is actually more expensive than buying from Kask directly. The item is manufacturer discounted. You can even get it at amazon, shipped much faster, with free returns. That's what I ended up doing to get the larger size (and the item I received from Kask via amazon was new).
4. I returned this item to Competitive Cyclist. Have not received confirmation of refund. Had to pay return shipping - again, not the end of the world, just FYI as you're shopping.

Hi Ian, thanks for your feedback! Sorry to hear you received an opened box - our returns team checks over everything that comes back but every so often something slips through. We're always happy to exchange for an unopened item.

Also we can usually price match authorized US retailers!

Fantastic! Just fantastic!!!

  • Familiarity: I've used it several times

An excellent quality, very comfortable and good looking. I am so happy I finally found a helmet for me!!!

Vitaliy G.

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!


Well I just got to say great to hear you bought another helmet. Which means you are back on, or getting back on, the bike.

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!

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