Shark Ridill 1.2 Nelum Motorcycle Helmet (Black/Pearl) From  €162.21

This is adorable and was a great price for a very solidly rated helmet. I haven't worn it for long periods of time yet, but I wore it on a 32° day for about an hour (with the visor up, I was taking my practical test), and I wasn't sweaty.

Be careful putting on the reflective stickers, though. They don't come up if you mess up. :)