Sadly, this is the first time I've been disappointed in a Keen product. I have purchased several pairs of Keen shoes over the years and, up until now, have been very pleased with the products I've purchased. I've always been a consistent U.S. size '9' in Keen shoes and I ordered this same size in this particular model. The shoes are so small that I double-checked to make sure that the labels inside of the shoes did, indeed, read '9' (U.S. size 9) -- which they did. I then held up each shoe, sole-to-sole, with my other Keens that are 9's -- I'm guessing that there is at least one whole shoe size difference, if not more. These shoes are at least 1" shorter than my other Keens. This shoe is also labeled as a 'slip-on hiking shoe' -- but even if I had the right size, I don't feel that these shoes would be appropriate or comfortable for hiking at all. There is very little support to the/in the shoe. This model of shoe also seem to run a bit wider than other Keens that I've had. I won't be ordering a larger size in this shoe. It's a great concept to have a hiking slip-on shoe, but I think there is room for improvement in this particular model.