[Jon]

I have a US size 9.5 My XC-ski boots and my Birkenstock's are both 43's. I've had a bunch of different fins in different footpockets. Here's what I used:

Sporasub's 42-44 with a 3mm sock

OMER's 42-44 with a 5-6mm sock

Spetton's 43-45 with a 6mm sock, and were still too big

Picasso's 42-44 with a 3mm sock

Esclapez's 42-44 with a 5mm sock, and still a bit loose

The fins where I wore only a 3mm sock I had tried to fit a 5mm in but they were just too tight and I lossed feelingin my toes.

Jon

Jon