Is wool better? Fleece is definitely cheaper so I'm leaning toward that but I'd like it to work and would spend the money on wool if necessary. Also, are wool soakers made from reclaimed sweaters as good? Or is it best to get a soaker specifically made to be a soaker. Also, am I correct in my thinking that you can use these instead of a cover? We're using Bummis covers and they're leaving terrible marks around my DS's legs. We pretty much only use the covers at night, are they waterproof enough for nights?