This slipper is made with a shoe lace that is threaded through a tunnel that goes around the rim of the upper edge of the shoe then ties in front.  If the shoe tends to slip off your heel as you walk (very annoying to me), this lace can be tightened to snug up the rim and the shoe no longer slips.  In my case I had to tighten the lace so much I needed a shoe horn to put on the shoes. Alternatively,I could untie the laces, loosen the rim, put the shoes on, snug up and re-tie the laces,  The shoes were no longer slippers that I could keep beside my bed and slip my feet into them and walk away.  Once on my feet the shoes were comfortable, but I wanted "slippers".  I"m buying a new pair of Evans slippers.