I have a CP fast helmet. As it is two halves for the helmet my head stays cool, due to the central gap for ventilation. Alongside I have guarder c9 eye protection, which I have worn for years and had no issues fogging up with this setup. Even without the helmet, I have never had issues with fogging up eye protection. The selling point of the guarder eye pro is that they had a test video on their website showing a pair being shot with a real shotgun from a meter away (yeah no face, but my eyes would be fine! 😆). The lenses were intact, only had some very fine marks on them.