I found these fit properly to size, as all Reefs seem to for me. I read some reviews here stating that fit was off for their pair. Perhaps there is some variability as to quality. Anyways I find these to be sturdily constructed and very supportive. I have medium arches and need a bit of extra foot support to feel comfortable. I can wear these all day, and living in a warm climate I often do. A great product; I always have a few pairs of phantoms around.