I just placed an order online for a much bigger cage for my rats. Right now I have an aquarium with a cage topper and I absolutely despise the small space and lack of ventilation. The new one is much bigger (made for ferrets) and I'm really excited about the room they'll have. My big concern is that most of the cage has wire floors and I am terrified of bumblefoot. I've heard a bit about using fleece as a good liner. I was wondering what other people use. I'm looking for something reusable if that is even an option as far as washing it and putting it back in. What are you guys using? What would you recommend?