I am an fan of Uggs.  I own 7 other pairs, with this style being my 8th pair.  This particular style runs small.  I normally wear an 11M in womens but had to get a 12m because the 11 was small.  I own the men's version of this boot and have that in a 10M.  The mens version runs larger.  Either way, I very pleased with my purchase.