There's a
thread somewhere covering what's inside. At first I was told to use poly fill. I tired it but at times the Abby would burn some of it and I didn't like the idea of breathing it in. Bunch of other people go that way too. A lot of people use tea bags or gauze. Right now I'm using sterile makeup pads (separate to make two halfs & cut to size). Make it a little smaller than you need to get plenty of air flow. Overfill and then let sit for the night. Works well with the Skyrl.
I got a new DSE and going to try it with that. If it doesn't work, I'll go back to the tea bags.
Why those? It's material and not synthetic.