TESTED: Kask Protone Aero Road Cycling Helmet

The Italian company Kask was founded in 2004 and produces helmets for a variety of activities as diverse as cycling, horseback riding, skiing, mountaineering and even working on a construction site. In the company’s relatively short history, they’ve seen some impressive levels of success, thanks in no small part to the brand’s partnership with Team Sky and its most popular riders over the past few years—Bradley Wiggins and Chris Froome, both of whom won Tour de France titles while wearing Kask helmets. Among its lineup of six road helmets are the Mojito for those looking for maximum ventilation and the Infi nity, which is Kask’s most aerodynamic road helmet. Splitting the difference is Kask’s latest model, the Protone.

The Protone is made in Italy and comes in two sizes—medium and large—and in a staggering 12 color schemes. The frontal area sports a series of long, deep ventilation channels, while the rear end of the helmet’s top section is closed off, designed to help smooth airflow when one’s head is in the on-bike position. There are several exhaust ports in the back to help maintain continuous airflow across the top of your head. Unlike the Mojito, which features a robust and really overbuilt retention device, the Protone’s is quite minimal and more reminiscent of those found on helmets from Giro and Specialized. It has a simple, single-hand-operated dial and a fair bit of vertical adjustability, while the actual plastic bits that make up the retention system are thin and minimally designed, which we suspect is an attempt to help keep the overall weight down.

Our test Protone was a medium, which Kask says fi ts heads with circumferences of 52–58cm, and weighed 230 grams. For comparison, a medium Mojito weighs 220 grams. Other details on the Protone include a leather chin strap with the buckle positioned so that it rests along the side of your face rather than directly underneath your chin, which is a feature we’ve found very comfortable on the Mojito model. The Protone’s Coolmax padding is removable for washing as well.


Fitting the Protone to our head was a simple procedure. The retention system is easy to operate, and the adjustment dial at the back provides plenty of customization in terms of the amount of tension you can employ. The sliding adjustment clips that sit below your ears are also easy to adjust. The chinstrap, on the other hand, required a bit more effort to dial in, largely because of the leather strap, which is thicker than nylon straps found on pretty much every other helmet on the market.

Regarding fit, the Protone has a very similar shape to the Mojito. It’s the tiniest bit on the round side (as opposed to oval), but should fi t the majority of riders’ heads comfortably. The Protone’s shell also felt just a touch bigger on our head than the Mojito that we recently tested.

While the Protone doesn’t offer the same ventilation as the Mojito, even on hot rides, our heads received enough airflow to keep us comfortable. If the temperature ramped up to the 90s or above, however, we found ourselves opting for a more ventilated model.

As for added aerodynamic efficiency over the Mojito, if what the bike industry at large has gleaned from the past few years of aero-helmet development is true, then the smooth surfaces and the closed-off portions of the Protone should give it a marginal increase in aerodynamics.

• Well-ventilated aero road lid
• Pricey, but high quality
• Made in Italy

Price: $299.95
Weight: 230 grams (size medium)
Sizes: Medium, 52–58cm; large, 59–62cm

View more of their helmets at kask.it

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