Cardboard/Fleece cage liner

Hi, I am getting a chinchilla from a breeder next week and I have done hours and hours of research. The cage i got unfortunately has wire floors so I have been looking into covering them. I want to use fleece but I am afraid it wont absorb urine fully. Is it okay for be to use cardboard that is covered by fleece with metal clamps. This way the cardboard will absorb the pee, and I can throw it away every week or so and wash the fleece.

Any advice/suggestions I would appreciate.