Do chinchillas need fleece?

Hi, so my chinchilla's cage currently has pine shavings on the base floor of the cage and then the shelves and ledges are either wood or fleece. I am purchasing a critter nation cage and I am planning on buying the bass equipment metal pans. But I'm not sure whether I should get the pans for the two shelves in the cage as well. If I don't get the shelf pans then I would just cover them with fleece as I know they are plastic and I don't want my chinchilla chewing them. I guess I am wondering if it matters whether my chinchilla has fleece or not in her cage. She will have plenty of wood ledges and some lava ledges as well to go along. I just wasn't sure if chinchillas prefer to not sit in bedding all day. thanks