I made the mistake of listening to one reviewer who wrote that "The sizing on these boots is very generous."
Another reviewer wrote that these would have been too big in her usual size, but then, also, "I have a fairly narrow foot".
Several comments about them being wide...
 The point is, that these comments are specific to the person writing them.
I always wear a size 9 shoe or boot.  Whenever possible, if I can find a wide width, I buy that instead, and they seem to fit better.  Not very wide feet, just a little wider than the medium width, so a 'wide' is more comfortable.
Thinking of the well-meaning recommendations of a few reviewers, I ordered these boots in an 8 1/2 medium width.
They were too short, and tight in the width!
I had to go on Amazon.com and arrange for an exchange, then print out the 2 pages: label & document to include in the returned box. Hurry and drive back to return for UPS pick-up. Amazon had a problem with their system, so instead of exchanging, they refunded the money.  Back on Amazon.com, to my account, find the 'Help' category and place a call to one of their reps.  He had to correct a mistake, he said, for several dollars which had not been refunded.  As a result, he had to cancel my original 'Exchange' order.
 Now I have to wait for two days AFTER they receive these boots, in order for the refund to be processed back to my bank account.  Only then can I place a second order in the correct size I should have gotten from the start.
Problem is, there's only a few left in that size.  Hopefully, I'll be able to get them, and write another review on how much I love them!
Motto:  Order your correct size, knowing ahead of time if your feet are usually narrow, or small, for that size.  Adjust if you think you will be wearing thick socks all the time.