Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Dangerous. Overheated.

I bought one of these heating mats and it worked pretty good, so I bought a second. The second had a serious overheating problem. I had on slippers and two pair of socks and it got too hot. I tried it without the slippers and could only put my foot with the socks on, on the mat for 1/2 second. Likewise my hand.The mat needs a breaker or a fuse on it to prevent such overheating if the thermostat or design of the heating elements fail as they did on the 2nd one.Again this mat would be very dangerous for an older person, a sick person, someone who fell asleep, etc.I can not stress the danger enough enough.