This is my first pair of rubber sole sanuk and I always buy size 12 in classic sanuk (which is one size bigger than I wear in any other shoes ). Classic soles were always a bit tight at first, until they broke after a few wears. A size 12 with a rubber sole was too big but Revain quickly changed it to a size 11 which fits perfectly. The rubber sole shoes don't have the ventilation eyelets like the classic ones, but they are very comfortable and a bit heavier than my old ones. Hopefully the rubber soles will bring me more value than my classic running shoes.