Silvretta 500 Bindings and Boot size

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?

I have the size she needs!

Ski, skin, binding setup posted on this site for $350

PM me if you need info

Cor wrote:

I have the size she needs!

He's right. I got to check his setup out the other week and it is very nice and the correct size for her.

Haha!  Thanks GLD.  Nice to meet you the other day.  If you were only a half size smaller…  but thanks for the bump!