I usually wear Clarks 11. I have other riders labeled 1012 which seems to mean 10 1/2 as well as 46 so I chose 46 in the size chart which is 12 in this shoe. The right shoe fit, but the left seemed to be half a size too big or too wide to be worn. I don't know if it was a 12, 42 Long, Cadet Large or P255R20 but it was nowhere near a suitable shoe. Overall they were cheaper than the other 3 pairs of Clarks I. Drivers. You get another free ride in a UPS truck.