I wear a size 5 shoes in womens and bought these in a 4. These were super tight and painful at first, but after wearing them consistently for over a year, they feel perfect. The downturned toe really made a difference compared to wearing a shoe like the Mythos. I really feel like these shoes improved my climbing confidence. Tried wearing them for crack climbing in Indian Creek, since I had nothing else. They did the job, but I can see how other shoes like the TC Pros or Mocassyms (I know I know both very different shoes) would work better for IC crack. I'm glad I snagged a pair on steepandcheap since they don't make them anymore.

good for narrow feet, these shoes don't stretch too much because they're lined. wearing US men's 9 in street shoe, i have the vipers in a 40.0. the stiffness is excellent for edging but i've found them slightly less sensitive and downturned than i would like. the cushion on the heel is actually a really nice feature that really helps for bad landings when bouldering.