Absolutely great shoes.  I work all day walking & standing on concrete floor - tried many shoes but the only shoes that  protected against back pain were the dawgs flip flops. However, in cold weather they weren't a good option, so I ordered these hoping for the best.  Exactly the same level of comfort - comfort while wearing & easy on the back and legs - excellent cushioning and comfortable fit.  They are made of a pliable, soft, flexible material - sort of a rubbery plastic?  They seem to shape to your foot size and shape.& the band across the top is a velcro strap integrated into the design.  The strap lets you fit the shoe snuggly.  Most shoes chafe me around the heel and ankle - but in these shoes, the back heel area and area under the ankle are both low enough to avoid rubbing on or under the ankle.  I ordered these for work shoes but they are so great I use them outside and in place of my exercise shoes.  Another bonus - when they get dirty you rinse them off, dry them off & they are ready to wear in 2 minutes.  Love!!