Thankfully I read the reviews before I ordered. As a result, I was alerted to order a half size larger. These are the perfect slipper that fits well, gives the mobility and stability of sneakers and they are warm. I am quite happy with this purchase.

Updated review:  I still wear my Keen slippers, but they have developed several holes in the felt outer surface.  After about a year or less, a small hole began to appear.  By now it has grown to a large hole and two other holes have appeared.  The inner material is still intact.  I am disappointed to know that I may not get a third year out of them.  I am not sure I will replace them with the same product.