The Vienna runs small. We previously recommend choosing 1 full size larger than your usual size. However, we recently resized so we now recommend choosing a half-size larger than your usual size if you have never had a pair of Viennas.
(If you purchased the Vienna before our resize on August 10th, 2019, then we would recommend going down a half-size instead from your previous size, as that would line up with the current sizing.)
If our recommendation isn’t accurate, we do have an exchange policy.