Originally Posted by
JohnJ80
I had looked at the Overtake helmet but
this review put me off. I know it's an oldish review, but their claim is that the material used makes it difficult for cooling ...
I'd take that review with a grain of salt. The helmet is presented as an aero helmet, and direct airflow through vents is traditionally non-aero. The helmet purports to be aero and yet still provide cooling airflow without the turbulence of vents - that's the main point, which complaining about vents misses entirely.
Secondly the helmet does provide cooling airflow (or purports to) from the Venturi effect of flowing air causing a low pressure region which pulls air up through the little tubes, regardless of their orientation. It won't be a cool breeze but it will be moving air which does provide cooling.
It wouldn't be unreasonable to take my opinion with a grain of salt either, since I'm not inclined to spend $300 for any bicycle helmet. But the MIPS version of the Overtake would be on my list if I did feel like doing that.