You may want to look into SPD sandals (Lake or Schimano). I found them quite preferrable to MTB shoes during the occasional days that I had rain on the way in.......with shoes, they rarely dried out in time for my trip home.....with sandals, it wasn't an issue. On the occasional mornings when temps were in the 30's or 40's, I would wear smart-wool socks, leggings and Sealskin socks....kept my feet more than dry and warm enough in the sandals.