This boot fits true to size, as opposed to the old Berryessa, that i also owned. If you're looking for warmth, this one is even better than the old one too. The shaft is wider, but it won't slouch. Very comfy, as Crocs tend to be. I had my old ones for almost 2 years (i wear them exclusively for work)before i needed new ones. I trust these will last me just as long !