I went to -33c mountain in Switzerland wearing sport shoes.

Other snowy area like Iceland also I wore sport shoes.

You will be fine in Japan.

Just ensure that your sock do not get wet can already. If wet, then dont stay too long until ur leg freeze.

If kiasi, then bring additional pair of sock.

But in Japan, I don't think you gonna wet ur sock unless u jumped into longkang or something.

This post has been edited by a13solut3: Nov 5 2017, 12:57 AM