I purchased a pair of Size 10 2Es for my housemate, who has wide feet and usually wears a 9.5.  He reported that the 2E was too tight, and also that the slippers bound too tightly against his instep.  In short, they were too small.  I have ordered a size 11, which I fear will be too large.  I am also extremely upset that the new order will cost me about $10 more for no apparent reason.  As it was a Christmas gift I did not want to make a fuss in front of him so I simply paid the difference.  NOT a happy customer.