The Giro Aerohead MIPS time-trial helmet plugs 4 wind-tunnel shaped vents into the polycarbonate shell for nearly 10 better cooling than the Aerohead Ultimate while hardly compromising its drag numbers losing just a second over 40 km at 400 watts. Internal channels in the EPS foam liner keep air flowing so you can cook the course without cooking your head and it’s backed with a MIPS multi-directional impact protection system that helps disperse rotational impact forces away from your head in case of a crash.