they've got my two outdoor cats through three winters now, though I have to put waterproof covers on them as well as the quilted ones - my new addition Penny is spending 23 hours a day on one on top of my wardrobe, and they fit nicely into a Mr Snugs kennel, which is where Tiffany likes to go
so all in all although not cheap they have been very useful for me, and they don't crinkle like some cheaper kinds do