It was something that bugged me during the Tour - why did the Kask helmets of SKY have no vents, surely that gets too hot. So I asked on Twitter last night after seeing GB's women were also wearing them - apparently the closing of the vents is an aero saving of 1W...
To ensure they don't get too hot the helmet is actually resting slightly above the head, so the airflow is directed underneath and into the space between, then out vents that remain at the back.
All very technological and clever - I wonder what sort of time saving 1W equates to over a 150km race, and over a 3 week grand tour.
Need to sort myself out with a new helmet if I'm going to do more CX. My old one is six years old - perfectly serviceable, but I think 'cooling' technology has moved on since then, and one of the problems I had was an overheating heid (partly due to long hair which has now also been rectified). Of course, needs to be orange/black/white to match the cc racing kit... ;)
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