i wore my sandals home from the shoe store and got a blister between my toes on the left foot.  the tops of the sandals rubbed my feet.  i was distressed thinking i spent a fortune for shoes that i couldn't wear.  but then i realized they need to be broken in.  i wore them just in the house with a paper towel between the first 2 toes of my left foot.  after 4 days no problem either between my toes or the tops of my feet.  these sandals are now very very comfortable - i just hope they tone my butt and calves and that i manage to lose an ounce or two like advertised.