There are lots of people who are concerned about that but a lot that aren’t, who understand that a little bit of aero that can go a long way. “When that came out, we had a ton of people say, ‘that bike is really ugly’. “Honestly, I’d say that it’s kind of like the S5,” he told BikeRadar. Then there’s the question of the Air Attack’s aesthetics, which Riedy admitted are polarizing but that for many riders, function will trump form. As well as the helmet’s aero claims, Giro’s own cooling efficiency testing places the Eclipse at 89.25. They offer a comfortable and spacious fit that should work for many riders, including those with higher-volume feet. There are 17 ventilation channels (confusingly, Giro lists 14 total vents) for aeration. With skate shoe styling, this model can easily bridge the gap between laps around the pump track and hanging out in town. This type of helmet is supposed to reduce aerodynamic drag over traditional helmets. The Giro Jacket II is a relatively basic but functional, wallet-friendly, shoe that is unique compared to the other models we tested. The Giro Air Attack Shield was one of the first of a new sub-genre of road cycling helmets that bridge the gap between teardrop shaped time trial helmets and traditional road helmets. That being said, such a cooling mechanism likely also depends on the rider moving at a reasonable rate of speed, meaning that at first glance, the Air Attack doesn’t seem to be the ideal choice for a hot day of steep climbing. Poorly ventilated especially at low speed. ![]() In fact, Giro PR man Mark Riedy claims that pressure differentials and Venturi effects make the Air Attack about as cool as having no helmet on at all based on Giro’s in-house testing on its instrumented headform (the Aeon, by the way, is supposedly cooler than a bare head). In theory, the combination creates enough space inside the helmet such that whatever air does come in has so much room to flow that the Air Attack doesn’t feel overly hot. There’s also a new Roc Loc Air retention system that helps suspend the entire helmet 3mm off the top of the rider’s head. Ventilation is obviously still a paramount concern for road cyclists, though, and Giro has tackled the challenge by maximizing the Air Attack’s internal channel design – an approach similar to the company’s full-blown Selector time trial model. The optional shield attaches to the shell with three magnets and features optics designed by carl zeiss: the optional shield attaches to the shell with three magnets and features optics designed by carl zeiss Courtesy The optional shield features optics by Carl Zeiss
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