I own several cat warmers, we use them in the winter to heat our feet in the cold bed. The hand warmers are great for heating my hands when I have been doing something outside that leaves them so cold, I think they will never warm up. I have given main warmers as gifts also, and the recipients love them. One of my friend’s cat claimed her maine warmer cat and slept with it all the time, insisting that it be warmed up again, when it got cold. My warmers have lasted for years, and we use them a lot.