Thanks all. I may order the size 9.5 (USA) through REI, and if they don't fit well in the store, they will go back into inventory, and I'll try size 10.

Vitaliy M wrote:Do you think these would be warm enough for sierra winter climbing, during days on which temp is not expected to drop bellow 10F?

I alternate these at work with my Koflach's (depending on the snow density) on an every other day basis in the winter, where the temps avg from 0-25 degs F. I spend up to eight hours on the sled or standing in the snow with em. I where a pair of OR Verglas Gaiters over em and they do just fine.

I wear a standard 8.5 US shoe and in these a 41.5 seem to fit just right with a medium weight pair of socks. Thus, pretty much right on size for me.