In reply to CurlyStevo: I'm aware that it's a compromise, they're cheap and better to climb in, so i'm willing to sacrifice some warmth (my feet are usually very warm anyway). Luckily, with the temps and lengths of time I'm dealing with, it's a case of risking discomfort rather than foot injury.
I'm in the process of changing the insoles and trying to get the leather to 'relax' out of the shape of the previous owners foot, hopefully i'll claw back enough space to fit my normal socks.