Living in Hawaii, I live in slippa's....all my walking and short jogging is in Fitflops.  I wish I was a saleswoman for the company because so many women ask me about them and order them.  I actually give them a 5-star, but they only come in "whole" sizes, no half sizes so I buy slippers that are a bit too large.  They still work, just a little loose.  Never have slipped off.  My previous pair lasted for 8 months and that is alot of hours!!  Morning to night, miles of walking, never a sore heal.
Would love to see them in half-sizes!