I have large, very flat feet, and as an older woman, it is difficult to find sandals that are cute yet support my feet and legs.  I cannot wear tight shoes anymore.  I got these, put them on and went to Walmart, walked all around the store.  My hip has been sore for a week after lots of heavy lifting from moving.  My legs and feet truly in pain.  i felt better at the end of the shopping trip and swear my hip felt better.  These are not as tough as Crocs brand nor as wimpy as some of the foreign brands.  I found they are soft, spongy but supportive. They grip too, no slipping or sliding as some higher end plastic sandals like crocs are tough plastic that does not grip tile or wet flooring.  THESE are  GREAT.  The sizing seems accurate for women's but these are not a man's 11M, they're more of a women's 11-12 M shoe.  Fine as I wear that size.