For years, helmet makers talked a lot about vents. The more vents, the better the helmet, common wisdom went (although internal channeling has as much if not more effect on cooling). Then the talk switched to aero performance: fewer vents were faster, but hotter. Now many companies are trying to finesse a happy medium between cool and fast. Some, like the Giro Synthe or the Kask Protone, settle for a single shape that is fairly fast but with plenty of air flow. Other, like the Bell Star Pro, Casco SPEEDairo or Kask Infinity, have moving parts to switch between aero performance and ventilation on the fly.
BikeRadar strolled the halls of the Eurobike and Interbike tradeshows to bring you this 'best of' road helmet gallery. Note that some companies like Specialized and Trek/Bontrager did not attend either one, so you won't find their lids here.
Casco
For 2015, the Casco SPEEDairo adds a Zeiss-certified photochromic lens, which lightens or darkens automatically depending on ambient lighting conditions. This lens was exposed to dotted light from a special flashlight at right for two seconds right before the photo was taken; the dots faded within about 10 seconds as the lens readapted to the indoor light conditions. The SPEEDairo is more vented than many aero helmets, with a light mesh to keep bugs out. The SPEEDairo's integrated lens is attached with elastic straps, allowing it to be removed and secured above while riding. The SPEEDtime, on the other hand, is an aero-over-all-else design. It's also not cheap, at €400 (US$515 / £318).
The Catlike Mixino is a US$299 helmets with 39 vents and deep internal channeling for air flow. The Mixino has distinctive sculpting, but its internal performance is notable as well. Catlike uses graphene nanofibers to reduce bulk but maintain strength. To accommodate various head sizes, the Mixino retention strap has detachable side panels with pads of various sizes. Ovalish pads at the rear angle-adjust for head shape, too.
The Bell Star Pro was introduced at the Tour de France. In addition to the integrated visor, the Star Pro boasts an open/close vent switch. The Giro Synthe is a happy medium between a well-vented helmet and a full-on aero helmet.
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The Kask Protone launched atop the heads of Team Sky riders at the Tour de France, but it comes in other options besides sky blue. The Kask Infinity, like the Star Pro, can open and close its vents. Here, that is done by sliding the center panel of the external shell up and down. Kask uses 3D Dry padding with deep channels. The stitched-flat strap junction was a request from pro riders, Kask says. EcoLeather is used on some of the Kask straps.
POC
Swedish company POC continues to push into the road market. It's Octal helmet comes in a MIPS option. The Octal's white foam provides good visual contrast with the yellow MIPS layer, which pivots within the helmet. POC has two lines - the AVIP 'safety' line that comes in bright colors, and the new performance line with a darker aethestic.
The yellow MIPS layer moves separately from the helmet shell, which can reduce brain trauma, proponents say