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KaskInfinity Helmet

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Item # KSK000D

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Streamlined for speed.

Though you might not think about it, chances are your cycling helmet is causing extra drag when you're chasing your friends down lonely stretches of highway and sprinting all-out at regional race events. The Kask Infinity Helmet offers an aerodynamic solution to your high-drag helmet woes with its streamlined shape and switchable front vents for adjustable aerodynamics with the flick of a switch.

This aerodynamic helmet is the same that's used by Team Sky, Drapac, and other professional outfits. And for good reason too. In fact, overall drag on a bike can be reduced by an astonishing 14% with an aero-optimized helmet. When every bit of energy matters in racing scenarios, the Infinity Helmet is your best bet for reducing drag and gaining a competitive edge.

Not content with merely being a one-trick pony, the Infinity is a functional helmet with adjustable venting. The front vents quickly open with a switch located at the top of the helmet. This allows you to adjust the venting with one hand when you're cranking at a high cadence. Keep them fully open when you're climbing and riding under the sweltering summer sun and close them when you're sprinting, chasing, and descending.

Keeping you protected from nasty spills, the helmet's polycarbonate outer layer is bonded directly to a polystyrene core for enhanced shock absorption. Softening secondary impacts, Kask's Frame technology consists of a lattice of Kevlar-like material that prevents the helmet from fragmenting upon impact. Plus, you'll find Kask's signature touches for extra comfort, such as its Eco-Leather straps and antimicrobial CoolMax padding that's removable and washable for easy care. Moreover, Kask's Micro Dial retention system keeps the helmet nice and secure with minimal fuss.

  • Aero-optimized shape
  • In molding technology (polystyrene core joined to outer polycarbonate layer)
  • Frame technology (Kevlar-like material prevents fragmenting)
  • Antimicrobial Coolmax padding is removable and washable
  • Micro Dial retention system
  • Adjustable front vents
  • Eco-Leather chin strap
Tech SpecsSize
Tech Specs
This product can expose you to chemicals including Bisphenol A (BPA), which is known to the State of California to cause birth defects or other reproductive harm. For more information go to
Shell Material
Impact Foam
Fit Adjustment
Octo Fit
Recommended Use
road cycling, triathlon, time trial


Vertigo, K50 EVO, K50 MTB
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.

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Perfect 3-season cold weather helmet

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

First I will admit I'm not a fan of the way this helmet looks. I use it anyway because it is the best cold-weather helmet I have found. The sliding vent lets you choose between aerodynamics and ventilation, and while there are aero helmets now available (Scott Cadence) that best it in both of those categories, this helmet is unbeatable in cold weather. I live in a 4 season climate with winter temperatures around the freezing point and summer in the mid to upper 80s on average.

The retention cradle has an incredible range of vertical adjustment, so most people can find a comfortable fit. If you have a long-oval head shape then Kask is not the brand for you. The chin strap is a nice touch, but from my experience it's indistinguishable from a standard fabric strap once you're moving. The padding inside the helmet looks a bit like a web, but it's comfortable and stays surprisingly dry at all times.

The real ace this helmet scores is its versatility, especially in cold weather. In freezing temperatures I use a light thermal skull cap with the vent shut completely most of the time. When my head gets a bit too warm, all it takes is maybe a 1/4in opening of the vent for 1-2 minutes and my head stays cool enough to remain comfortable. In temperate conditions it's vent open most of the time except for when you really want those marginal gains, be it races or a fast group ride.

I can't give this helmet a perfect score because the ventilation doesn't cut it if you're trying to use it on hot summer days or in the mountains. For that I use a much more ventilated lid, but one can complain that at this price you should be able to use a helmet year-round, regardless of how spectacular it is in colder conditions.

I have put 4000 non-summer miles on this helmet and find it to work extremely well, aside from a small rattle issue. When the vertical adjustment on the cradle is fully extended downwards, there's a small amount of play between the notched plastic slider and a small piece holding it in place in the center of the helmet that causes some rattling from time to time. The way to correct this is to adjust this cradle upwards by one small click, and then the rattle subsided.

Overall it's a great buy but at this price I don't think it's excellent enough for a 5 star review; 4.5 stars would be more like it.

Good review Adam T. I agree that does an outstanding job at helping regulate temperature in the winter and went temps change between seasons. Though the build quality is top-notch it’s on the heavy side. It also keeps your noggin very dry on rainy rides too. Worth every penny.

Very expensive but still worth it.

  • Familiarity: I've used it once or twice and have initial impressions
  • Fit: Runs small
  • Size Bought: M

For years I've been been switching back and forth between 2 helmets. One is light and well vented but not aerodynamic and the other is aerodynamic but one the heavy side and minimal vent, I hope this is going to be my to-go helmet. After a couple of rides about 100 miles I feel it's better than the Air Attack. Definitely a bit cooler that the Air Attack when opened. There is no scientific way for me to compare with other helmet on the flat so I'll skip this part, but on the descend I was able to hit the top speed 53 MPH without all out effort. Sizing is a bit on small side. I bought M, fit me fine but a little bit less adjustment room compared to the Air Attack, so if you're between the sizes, go up! Also the labeled weight on M is 340 grams vs 260 in the Tech Spec. Don't know where CC got this number. Must pull it out of their....Strap system feels more comfortable than other brands

You get what you pay for

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

I bought this helmet for racing in flat conditions or in cooler weather. If I remember right, Velonews conducted aero testing and found that the Infinity (with the vent closed) was substantially more slippery through air than the Evade or Giro Air Attack. In a race where even a couple watts can be the difference, this advantage is worth the cost to me. It's hard to justify the cost if you commute or more casual, but that isn't the target demographic.

Apart from the aero performance, the helmet padding is nice and plush. There is nothing that looks or feels cheap here. The vent slides easily, but has enough resistance that it'll stay secure wherever you put it. The Infinity is comfortable and highly adjustable. It does get hot with the vent fully closed, but that's understood and accepted when you need the aero benefits.

I've worn this helmet a ton and won races wearing it--no regrets buying this!

Great helmet!

    I love KASK- they are my go to for helmets. This helmet is no exception. Great as an aero helmet. But... ALSO good as a cooler weather helmet. The big vent is a nice feature for changing temperatures. I use it primarily in cooler weather and it works great. I am a small in every other brand- a Kask Medium works great.

    Great helmet!

    Dont love it.

    • Familiarity: I've put it through the wringer
    • Fit: Runs large
    • Size Bought: medium and large

    first the pros: I bought this for winter riding. It is definitely warmer than any other helmet I've worn in the cold. It is a little quieter though not a real selling point for me. I do like that you can vent it if you need to. It does look super cool! I mean this thing is the prettiest girl at the prom! EVERY rider checks this thing out and let's face it, as cyclists, we like that.
    The con: it really does have tons of different adjustments and i have spent tons of time trying to adjust it. I have 2 months and 1000+ miles in this thing and still don't have it dialed in enough to glow about it. I bought the med and large to fit it right The medium actually fit perfect but the straps were too small. The large is just a little too much for me. I find it to be a large, bulbous, heavy helmet. I spend 5-7 minutes fiddling with this thing at the beginning of every ride after i have spent 10 minutes adjusting it before i leave the house. Some sunglasses fit ok with it others don't at all. On my head, this reminds me of an entry level $60 bell. I really expected better considering all the reviews and the price.

    I will continue to wear it through winter because it's warm but i cant wait to put it away in the sping.

    Cool helmet with some issues

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

    I saw this helmet on GCN and the guy said that it was really good for cold weather because you can l close the vent making it aerodynamic AND keep the wind out. So I bought the helmet. I always wear a size large in every helmet I've ever owned. When I tried it on, it would not go over my head. Darn! What the heck, right? I returned it. My LBS was surprised it would not fit because he said it was actually pretty roomy. He asked, "Did you open it up?" I asked, "What"? "Did you pull the adjuster knob down"? So, there's an adjustment knob assembly at the back of the helmet that you need to pull down and open up so that you can get it on your head. Duh-oh! When I pulled it down and opened to adjustment knob, it fit like a charm. The problem in that the first time I wore it, when I went over bumps, the air vent door rattled! It sounded like something in my front end was rattling - but it was the helmet door! The good news is, it's comfortable, fits well, looks pro, and gives you a ventilation option. The bad news: it rattles when you hit a bump.

    The Kask Infinity Helmet is not the same style per the picture if you look at solid black and the black/lime. Why is that?

    Hi T Robert T, the black/lime photos show the front vents exposed with the slide open. The black helmet shows it closed.

    Not all seasons

      This helmet is one of the best I ever had, but it is not for all seasons as some people claim online. What is true! Very comfortable! Light! And you will lokk like a pro! :)

      Great helmet BUT...

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

      First of all, the helmet does not run small. It is just shaped for people with round heads and not oval. I have a really big round melon :) and all Kask helmets seem to fit me very well. However, I am running in a major issue with the helmet that I am not sure what to do about. The rear adjustment strap does not stay in the position and constantly gets loose. My other Kasks do not have that problem. Since I used it several times now, I am not sure I can still return it to Competitive Cyclist and even if I do I am not sure if a new helmet would solve the issue. Thoughts?

      Really Small

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

      I measured my head three times, ordered a medium and it was WAY too small. Rechecked the size on the box and the tag inside the helmet, both gave the same size in cm for head diameter. Maybe take them up on the $7 try them all deal. I'll post again when I get one that fits.

      I got a large today and I could uncomfortably get it on my head - kind of. So my advice is to go up 2 full sizes. If your head is a medium go for a XL. I'm giving up.

      In fairness to Kask, I want to add to my reviews and comments about size. My head shape is what they call a long oval for motorcycle helmets. I think the problem with the Kask helmets being so far off is that they are molded for people with round or oval heads, which I think is the majority of people. So they don't work for me, but they might if you have the appropriate head shape. Too bad the manufacturers don't have a way of telling consumers whether their helmets are round, oval or long oval.

      No place for a ponytail!

        Wanted to like this helmet but it just didn't work with a ponytail! Loved the optional vent though!
        I have the original Vertigo which is very ponytail friendly so I might go back and order the Vertigo 2.0!


        • Familiarity: I've put it through the wringer

        I have had this helmet for a couple Months. I'm in Fl so I was concerned about the venting however it vents good for an aero. You can feel it cutting threw the wind with the vents shut and the air rushing in when open. A friend of mine felt he was at a disadvantage when I wore the helmet so much so, he went out and bought one also. He has not worn another helmet since. He rides with the vent closed only. I do open and shut mine all the time. I bought the Giro Synthe and will wear that in the heat but when it's cool or when riding with the fast guy's this is my helmet out choice.