We go for heating discs!!! Newton should be the spokes-kitten for “SnuggleSafe” discs. You heat them for six minutes in the microwave and they stay toasty for 12 hours. He literally tramples other cats to get to the bed when he sees the disc coming back from the microwave from being heated. We wrap them in a towel so they are extra soft for Talia and her arthritis, which was why the first one was purchased, but Newton was so possessive, a second had to be added.