Smaller than we expected. Our son wears an 11 or 12 normally and these are a little snug as a 12. Will probably get a larger size to get him by until next spring. Also he developed a raw spot on the inside of both feet in the same spot,  near the place where the strap attaches. Despite issues I gave these 3 stars because they seem well made for the price , they just run small which is likely why they rubbed his feet.  UPDATE 9-9-15: We ordered a size larger, and it was about the size you would expect a 13 to be, which sounds great except that we expected it to run small like the 12, so now we have one pair that is a little too small and one that is a little too large.  Hmm.  Silver lining is that he might still be able to wear these next spring,  My advice is to try these on inside the house and take advantage of the free returns on this item if they do not fit (we didn't).  At least they're cheap.