Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Poor design

These don't work for me at all. The fleece booty is very thin, so offers less warmth then a simple sock. The material that heats up in the microwave is just a bag that sits in the sole of the booty, so there is only warmth from the bottom. Since it is too bulky to walk in, you obviously need to wear them while lying down, which invariably means the heat sags away from your feet. The only way they warmed my icy feet is to have my feet tightly wrapped in blankets to hold the heat in... but a simple heating pad or a sinus pack that warms in the microwave has just as much effectiveness. So, ultimately, I was very disappointed. I hoped they would be an option to warm my feet while watching TV, but my feet actually got colder without any protection on the top of my feet. Pretty disappointing.