In reply to Laura Hamlet:
I have in the past found the sizing on Mammut boots to be fairly 'true', ie: I'm a 7.5 and the 7.5s fit me well. However, more recently I've not found that to be the case, and 2 pairs of their more 'kick arse' boots, the Mountain Cliff and Monolith, were a touch on the small side. Don't know if this is since Mammut took over Raichle (the previous boots were under the Raichle label), or if it was just because of a different last.
I'd go to a shop, but I appreciate you wanna go mail order!