Love these!  Recommended by my orthopaedic surgeon who also has flat feet!  I haven't taken these off since I got them!  Wear them around the house and to do quick errands around town, grocery shopping.  Run true-to-size.  Soooo comfortable and supportive for my fallen arches.  Like walking on two huge sponges.  Kind of have a springy bounce to them that feels cushy when you walk.  They do make my feet sweat a bit, but they are easily washed with soap and water and a facecloth cuz they are totallly waterproof like showering sandals or rubber flip flops.  I just had 2 knee replacements within the year, and with the fallen arches, these are proving to be my "go to" casual summer sandals.