Chris Swrote a review of Kask Protone Helmet on June 8, 2015
Familiarity: I've put it through the wringer
This helmet is expensive, but it's optimized for racing and is really for those who don't simply want "good enough" but insist on quality in every aspect of their helmet: looks, safety, functionality, weight, and comfort. The Protone has this in spades. My other helmet is a Louis Garneau Course, a primo road helmet that I liked and was the best I had owned up to this point, but it just seems crude in comparison to the Protone in just about every aspect.
This helmet is designed to combine ventilation with aerodynamics. I've done 20-minute hill repeats in 80 degree weather and the helmet does not add to the suffering in terms of weight or me burning up. The ventilation simply works. All that reminded me that the Protone was there was a single trickle of sweat down the glasses. The front sweat pad is the best I've yet seen and a feature that I did not guess existed but has now spoiled me. With the LG Course, I often got a steady stream of sweat and sometimes have to stop to squeegee the front pad. Plus, the pads would leave indentations on my forehead that wouldn't go away for a few hours. These are minor annoyances and typical of the other helmets I've owned (and so, not a slam against the Course), but Kask took these problems seriously and made the effort to fix them.
This is just one illustration of how the attention to detail is a cut above. The other padding is superior to that of any helmet I've had, dense and plush. The fit is ridiculously adjustable, at least compared to what I'm used to. There's a synth leather chinstrap, which won't get crusty and chafe as you sweat all over it. Racing is hard enough and I have to wear a helmet anyway--these details help me stay focused rather than distracted by petty discomforts.
The aerodynamic qualities can't be quantified by me, but they're plausible from looking at the helmet design. The leading edge, where there's usually a high air pressure point, is a vent. Within the helmet are air channels to direct the air over the head and toward the back vents. The front structural parts of the helmet shell are concave in shape, something you can't really see in the picture--rather than the air hitting them and then hitting the side of the vent (and increasing drag), the shape when you're at speed deflects the air over the vent or channels it over the back of the helmet. How cool is that? The back part is plainly aero, a smooth shell with a snub back and even a slight tail. If you turn your head or are getting whacked with a cross-wind, you won't pay as high a price in drag. The helmet actually feels more slippery than the Course.
I can't speak of the safety features until I crash and smack my head on the pavement, but this helmet is certified as meeting the same standards as any other road helmet in the US and looks very sound. If you view a helmet as simply a safety device and nothing more, the cost of the Protone will be hard to justify. And that's okay. Those of us who race often value the performance aspects, comfort, and are vain enough to want our gear to look awesome. If some of the attention to detail that Kask has put into this helmet matters to you then I'm not sure you can find a better lid.