What Ounce Wadding Would I Need

I just use a few layers of craft foam or cut up a sleeping mat that is no longer needed. Some people use stuff called “batting” or something I think...
 
I don't know the weight, but I used the thin stuff the first time. The piggies just sat on top and flattened them into mats, so I tried thicker stuff which held its shape better and actually remained as a tunnel.
 
You could check out a few tutorials on youtube, a few of them have measurements etc included.
 
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