I was lucky enough to get these Keens on sale, but they are worth the full price.  The elastic bungee tie is easily adjusted and fits my high arches perfectly, though the tie itself sticks straight up.  I'm hoping that will fix itself as time goes on, and it's not a deal breaker.  My shoe size varies from 7.5 to 8 depending on the brand, and some Keens I've purchased in the past in a 7.5 are just a tad too short, so I bought these in the 8.  They're exactly the right size.

The shoe stays on my foot, despite the open back and thanks to the bungee.  I love the covered toes and the tread on the soles, and look forward to years of life from these.