ibi4774469 wrote an answer about Evolv Defy Climbing Shoe on December 22, 2011
I wear a size 12 street shoe and i sized down to 11.5. They were pretty comfortable as my first ever pair of climbing shoes. I never had a problem. Now I'm going to bump down to a size 11. The shoes are feeling pretty big and not snug enough after 10 months of use. Plus I'm used to them and I have to cinch down the straps all the way for them to feel close to snug enough now.
BTW...if you don't let them dry out after using, they'll stink to high heaven. I use a anti fungal spray religiously now. They got pretty nasty!