http://http://www.dirtsurfer.com/en/productsribcap.asp
Insane if you don't like helmets but you want to protect your head.
100$, some of them look gay. Others are decent not the best though.
Here is it on amazon
http://http://www.amazon.com/Ribcap-Marley-d3o-Protective-Hat/dp/B000KJD0LW
Youtube
Thinking about getting one