+1 on the Lazer.
I can't comment on the cooling effect but I can say that it's on my buy list since it's the most comfortable helmet I've ever put on. Sadly, I didn't know I was uncomfortable til I tried one :/ Figures my head likes and only fits the more expensive Lazer helmet.
It's gotten great reviews.

Originally Posted by
Trekhawk
I don't cope with the heat at all and unfortunately the summers here are brutal so I do all I can to keep as cool as possible. This summer I purchased a new helmet and have been very happy with my choice. The venting is a lot better than my old Giro helmet.
http://www.lazerhelmets.com/en/catal...white-blue-614
Good luck with your search.

Push the pedal down watch the world around fly by us