Very uncomfortable
The strap itself is very good looking.  I got several of these, the other two had velcro closures and this is a slip-on.  Within about an hour of wearing it on my ankle it was very uncomfortable.  Because there's no velcro to adjust the looseness, it rubbed my ankle a lot.  As someone had said, you won't get any sleep measurements with this cover, so will have to remove it from its pouch (takes 10 minutes to get it in the pouch and about 5 minutes to get it out) each night and put the watch on a wrist band to measure sleep.  It does a great job at measuring steps, but the discomfort on my ankle isn't worth it.  Suggest getting a velcro closure instead.  It is very pretty, though.
Rating: 2 stars