Love these!!  So comfortable and a huge relief to the foot pain I was having (ball of foot and heel pain).  I wear a size 9 shoe and a size 9.5 running shoe, and after getting advice from other Amazon buyers, decided to buy a size 9 women's (size 7 mens).  The fit is just right with bare feet.  A little snug with socks, but I was looking for a good fit with bare feet with summer coming up.