One of the most important senses we have as bike riders is our hearing. But Irvine, California-based Sena has consistently raised the bar on bicycling helmets with integrated speakers. Their newest offering, the S1, blends Sena’s audio technology with the aerodynamic advantages craved by so many road cyclists. Wind ResistancePhotograph: Michael Venutolo-MantovaniWith a smooth outer shell, the Sena S1 looks, fits, and feels every bit the aero road helmet that has boomed in popularity over the last decade. Luckily, I had a Sena S1 sitting in my office.