Im looking to set up me and my partner with a backcountry ski set up using silvretta 500 bindings. I wear a 46.5 mountain boot, and my partner wears a 38.5 mountain boot. Currently she wears Nepal Cubes or Spantiks.
I know that I'm going to need the large size silvretta 500 binding for my boots, but what size will fit my partner's boots? Small or medium?