These make any shoe akin to a Birkenstock sandal -- super comfy!  They provide arch & metatarsal support while leaving lots of room for your toes.  I generally take existing / stock insoles out of shoes & put these in over a Dr. Scholl's / flat-type insole so that there's some cushion under my toes.  They are really durable, though the silk cover will get worn over time.  These function better than my $200 professionally made orthotics or any other retail insole I've tried, allowing me to postpone (or hopefully avoid) surgery.