Remember kids... always wear a helmet. (The almighty bikeradar helmet thread)

It's not a wooly hat after all, so as many vents as possible and as little weight as possible are the way forward.

+1 I sweat like a whore in church/scouser in Dixons/a gimp in a sauna, etc.. even wearing a Giro Ionis....

but my 3yr old daughter would no doubt love the pink design above.