My Kitty-Boy is very picky about his bedding. Any changes in that area are not welcomed. After I sprinkled on a little of the catnip they thoughtfully enclosed in the order, he jumped right in started playing around with the Caterpillar I had also purchased, and finally dropped off to sleep, cozy and happy. I was concerned there wouldn't be enough room, but he's got plenty of room to spare. I put my hand in there to pet him, and it was cozy-warm in there. I'm going to feel much better about him using this on cool nights and throughout the winter, knowing that he will be warm. So, congrats Friendsheep - you aced it!