I'm looking at getting these, my first barefoot style shoes. Size 12. I take a broad size 12 or a normal 13. 12 is "cosy" 13 is "roomy".

Any experience on the sizings of these? I want to take the 12, but I don't really want to return them.

How do these hold up in wet weather, I live in Glasgow (Wet West of Scotland) during winter.