I'm usually a size 11.5US, but this size was not available.
I purchased the size 11.

The fabric tends to stretch which gives some wiggle room, but the sizing is just slightly too small for me. My toes hit the front of the show, which is ever so slightly annoying but not uncomfortable.
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I really appreciate the styling of the shoe! The comfort is also very good, but would be perfect if it was only a 11.5..