The reason for one less star is the speaker. As others state, fitment is an issue. Most everything can be made in this pot though with common glass dishes and the included trivet. I really need to work out to strengthen my knee. I think it helps keep the foot snug in the slipper to hold the heat in, especially when you want immediate warmth if they are cold as mine feel often because of poor blood circulation. He loved these, so I wore them a few times taking the dog out. It is nice to be able to work on the car and not get have wires to get tangled up, or to have the neckband slip and slide out all over. I can open these ones easily with one hand, so we can get on with our sniffing. The width is accurate; however it is necessary to get the proper width because they dont give and relax like leather shoes . ESD-Schuhe verhindern den Aufbau von elektrostatischen Spannungen.