Stackie
I bite.
I don't see one layer of fleece staying down very well. The two layers are definitely more heavy and stable? I guess you would say. Just a single layer of fleece is not much and would not have very much absorbancy, either. Sure, you could use it, but unless you have it weighted down very well it'll probably be pushed around a lot and you will have to change it out very often due to lack of absorbancy.