No batting needed if using fleece. Use 2 layers.These are one size and they can be made so they you can use buttons or a elastic piece. I ran out of fleece so will need to get more, butin the meantime, I'm just messing wiht these. I was just playing with these last night when I should have been sleepinjg. You could even use a regular hunk of fabric and put the fleece in for the inside. I may try that too just for fun. Pay day tomorrow so I will go and get some fleece to make some and then wrap them. Have a great day,, going to go take a little nap now as I need to get a little more sleep. Huggies, Fay.. P.S, the ones I've seen in the catalogues that have a place that the bill of a hat comes through is made out a thin fabric or fleece. It looks kind of cheap to me.