I use these for short trips outdoors in the rain to performs chores. It is convenient to be able to step in and out of them just by leveraging one foot against the other - no hands required. At first their stiffness rubbed on my ankle, but that is softening up. I like them. I usually wear a 9 and size 9 fits but is a tad loose. I don't know if an 8.5 would fit me or not. They are fine for my purpose since I don't wear them for long periods of time.