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The Giro Aeon Helmet proves that lightweight and highly ventilating aren't synonymous with fragility. Despite its claimed weight of 218 grams -- around 45% lighter than most of its competitors -- and 24 capacious Wind Tunnel vents, the Aeon is CPSC certified, so there's no compromising safety for a light helmet and a cool head. With such an effective recipe for cool-headed safety, the Aeon remains largely unchanged for 2015. The Aeon sees the return of Giro's Roc Loc 5 retention system. The Roc Loc 5's indexed Micro Dial lets you adjust the tension with a two-fingered twist, and the three position bracket allows 15mm of vertical adjustment in the retention basket. Even in an age of mass production, Giro's Roc Loc 5 Fit System makes the Aeon fit like a custom one-off. While other helmet manufacturers have similar adjustability options, none of them even come close to the weight savings that the Roc Loc system offers; it's almost 40% lighter than comparable systems. The Aeon uses in-mold construction to fuse the foam liner to the abrasion and puncture resistant polycarbonate shell as other Giro helmets. However, Giro uses a low-density EPS liner for the Aeon that performs the same important task of absorbing impacts, yet it's 15% lighter than the foam they used previously. These weight savings are further complemented by the Thermoformed SL Roll Cage, which acts like a second shell to maintain the helmet's structural integrity and disperse impact. The added strength also means that Giro can add negative space to the Aeon without sacrificing safety, so it's more ventilated and lighter than its predecessor. Occasionally, it's easy to imagine that helmet designers simply fill every possible space with vents and gaps designed to look aerodynamic or cooling or both. Not so with Giro, whose proprietary Wind Tunnel Ventilation System combines 24 vents in the shell with internal exhaust channels. Fresh, cool air from the front is strategically guided around the head to he...
$200 Go to
Backcountry.com
Aerodynamic road helmets became something of a trend over the last couple of years, with Giro's Air Attack Shield Helmet leading the way. It doesn't lead from the wind tunnel, though, which is where so many of these helmets get developed and tested. It leads from the velodrome, where the pros from BMC Racing recorded times that were 56 seconds faster over 40 kilometers. It leads from Kona atop Cave, the world champion from Great Britain. Now, it's leading into 2015 with the same design that makes it a favorite for pros across so many disciplines. The helmet features the same front area as Giro's Selector time trial helmet, with the back -- or rather, the lack thereof -- really setting the Air Attack apart. Wind tunnel testing proved that passing air still thinks it's moving around a long tail, when, in fact, the excess material no longer exists. In addition to now having roughly the same minimal drag (only 11% more) than the Selector, the Air Attack provides a drastic increase in weight savings, 264g versus the Selector's 430g. The low-vent design initially inspired fears of 100 degree Fahrenheit days with a stifling bowl on our heads. Giro researched solutions to this concern with something it calls the Therminator, a head-shaped object equipped with sensors. The Therminator went into the wind tunnel and data came out, showing Giro where vents work, where they don't, and providing a map for ideal ventilation with as few vents as possible. Giro also found that as air hits the rider, there is a very high pressure zone right at the forehead. In response, the Air Attack's new fit system, known as Roc Loc Air, suspends the rider's head off of the EPS, allowing air entered in that front three millimeter portion of the helmet to flow over the top of the head and out the large, strategically placed back channels. Amazingly, the Air Attack boasts 97% of the cooling efficiency found in the barely-there minimalist Aeon helmet with an 11% boost in aerodynamics. The poly...
$240 Go to
Backcountry.com