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

My head is huge. It goes off most scales, measuring at 63 - 64 cm (depending on air pressure / tidal motion).

Hence the need to try before I buy, as even XXL sizes that claim to be big enough, seldom are big enough.

I have a similar problem. This place:

http://www.kingofwatersports.com/bern-watts-helmet-black-i4048.html

DID have XXL Bern Watts in stock, but I think they sold the last ones and more are due at the end of October.