In reply to bedsforsleepypeople:
I worked in an outdoor shop for a while and ended up spending a day plodding around in Monoliths. While it's not the same as going on a mountain I did get a feel for them and decided I couldn't get on the them. The pair I tried had an unusual asymmetrical ankle that, while provided a good amount of support didn't allow me a great deal of movement. I wouldn't say they were flexible for B2. No more flexible than anything else I have tried.
You need to try them on I guess.
Post edited at 21:02