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Came up a size too small for my usual size for ugg boots, when I eventually shoved my feet past the extremely tight braiding on the upper I found the back far too low and my feet kept coming out the back when I walked. The most disappointing pair of Uggs I’ve ever bought.
Initially I bought my regular size but was unable to get my feet into the slippers past the tight decorative band. Exchanged for next size up. Much better fit and though still ‘snugg’ (!) I know that the lining will flatten a little over time.