So I got these. I had almost 2 finger lengths between my heel and the back of this slipper. I have 3 pairs, and would buy them in every colour available. However, Im not sure when Id use this. Dont let the picture fool you! I can definitely see us utilizing it for a very long time. A+++++ Also without NFC. They are a little big but wearable. Comfort: The big thing for me is ok its old but does it feel comfortable because if it feels comfortable and works I am ok with that.