Love them and they warm up quickly!  Small zipper issue but it's an easy fix with a couple zip-ties!
Love these!  They work so well and are faster at warming up than I thought.  The only problem I have is the zippers unzip easily, exposing the warming sheet.  Sometimes, if I leave the slippers out and people walk over them and hit the chord, the warming sheet comes out of the slipper complety.  It's an easy fix though -- just link a small zip-tie to each zipper on each slipper (hey, I made a rhyme!) and the warming sheet won't come out!
Rating: 4 stars