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Giro Synthe helmet

It has a few subtle aero tricks up its sleeve, too. The solid mesh panels on the side of the Synthe control the air flow's boundary layer. Air flow on the front of the helmet gets caught up, increasing pressure, then pushes out of those solid mesh panels, creating a boundary layer as it evacuates the helmet. Photo: Caley Fretz | VeloNews.com

It has a few subtle aero tricks up its sleeve, too. The solid mesh panels on the side of the Synthe control the air flow’s boundary layer. Air flow on the front of the helmet gets caught up, increasing pressure, then pushes out of those solid mesh panels, creating a boundary layer as it evacuates the helmet. Photo: Caley Fretz | VeloNews.com