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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

Tech Specs

Shell Material:
polycarbonate
Impact Foam:
EPS foam
Fit Adjustment:
Octo Fit
Visor:
no
Certifications:
CE EN 1078, CPSC 1203, AS/NZS 2063
Claimed Weight:
[size medium] 230 g, [size large] 250 g
Recommended Use:
road, cyclocross
Manufacturer Warranty:
limited lifetime

Size chart

Kask

Helmets
Vertigo, K50 EVO, K50 MTB
M L
Head Circumference18.9-22.8in
(48-58cm)
23.2-24.4in
(59-62cm)
K10 MTB, K31 Crono, K10 Race
One Size
Head Circumference20.9-24.0in
(53-61cm)
How to Measure:
Measure around your head where your hat would fit comfortably.

Reviews & Community

REVIEWS

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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 48m 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. Also, glasses don't sit well in the vents unless you flip them upside down.

    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.

    Fantastic Cycling Helmet

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

    I just received my Protone helmet and took it on a 60 mile madden voyage. I decided to transition from Laser Helmets to Kask based on reviews. I am totally glad that I made the jump. The Protone is by far the most comfortable fit I have ever had, and with all the different adjustments by far the most stable platform. I am glad I made this transition and totally recommend their helmets.

    Avg. ride time: 6h 55m per week
    • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

    Cool and Aero

    • Fit: True to size
    • Size Bought: Medium

    The Protone is a do it all helmet, it is both aero, and provides adequate cooling compared to some other "aero" only helmets. Wraps over, and around the head more than some other helmets, but don't even notice it is on during long days in the saddle, like it so much I have two now. The leather chin strap is a super high-end touch.

    Pretty excited about this helmet

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

    To those who felt that this helmet was heavy I feel that you are crazy. I can barely tell when I am wearing this helmet. I have worn this helmet up to 62 miles (100 km) without feeling neck pain from additional weight. The chin strap is very comfortable, as it is leather, but takes a little longer to adjust. The ONLY change I would make to this is to make the ear loops slightly longer. I just prefer them being a little more below my ears.
    The rear adjustment is great. I have worn it with my beanie on a cold ride and haven't had an issue. Even when riding unbuckled it sits well and doesn't slide around nor does it cause that headache from being too tight.

    I got the large and I wear a 7 5/8 hat if that helps any of you.

    So many PROs and no cons to the PROtone

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

    I used this helmet on an Ingamba bike tour trip and I LOVE it! It is super lightweight and comfy it felt like I was not even wearing a helmet at all. Helmet has great sunglasses holes on the top too which are perfect for the all important pre-ride cafe stops and post ride pub stops. I wear a medium in all my other helmets and a medium in this helmet fit perfectly and accommodates a cap or headband underneath for colder rides. Here's a pic of me rocking the Black Protone with a cap under it. Seriously recommend this helmet.

    So many PROs and no cons to the PROtone

    Quality and adjustability

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

    Coming from a mixino, which i really liked, i wanted to give the protone a try. Plenty of ways to adjust to your head's shape. The chin strap took a while to get used to, but now it's not noticeable. Ordered medium snd have 58 size oval head. Nice low profile and very comfortable.

    Avg. ride time: 10h 13m per week
    • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

    I need a small in this model. Kask does make it. Why does no one carry it? Plans to carry it in the future?

    I heard from local bike shop that the small was a "new" thing and just coming out this year. Not sure when but this person does all the ordering for the local bike shop so I think he should know this kind of stuff.

    Who are you calling a Fred?

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

    The Kask's subtle matte black finish doesn't try to compete with my Attaquer 'Bird Watching' kit... good thing cause the Attaquer wins every time. You simply won't find a better fitting helmet -- the rare bump that does sneak past my IsoSpeed decoupler is no match for the pre-dialed placement of my sexy Protone brain bucket. My only complaint, which is a small one, relates to the helmet's inability to house my Oakley Blade Trinity sunglasses when I'm rocking it sans shades.

    Road Ready!

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

    This Kask Protone is the perfect road helmet. First, it is comfortable and the straps adjust to fit perfectly. Second, the venting works very well. No problem in the heat and humidity of So. Florida. Thirdly, The aerodynamics are amazing. Noticeably quiet and free of drag. I have no comment on protection, as I have not tested that feature. Easily the best road helmet I have ever owned.

    Avg. ride time: 3h 13m per week
    • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

    Kask Protone Helmet

    Best Ever

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

    This is the most comfortable, best fitting helmet I have ever bought.

    Best helmet ever!

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

    I love this helmet! I have had a ton of different road helmets and this is by far my favorite. It is lightweight, has a classy leather strap, good color choices and overall looks super pro. I usually wear small helmets and this helmet starts at size medium, which fit me well so I think the sizing runs small. I would highly recommend this helmet for high performance road riding/ looking good at coffee shops.

    Avg. ride time: 12h 10m per week
    • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

    Gucci

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

    I've had good experiences with Giro and Specialized helmets but this Kask takes the cake for comfort and adjustability.