FANTASTIC!  I have very wide feet in size 11.  I bought the Large size.  These were large enough not only to squeeze my huge flippers in, but also to get a nice set of insoles as well.  I wore them all day long at a recent outing and they were as comfortable as sneakers and looked fantastic with a kilt!  Quite a few folks even stopped me and  asked where I'd got them.  Worth every cent.  Now to see how long they last!