You've gotten great advice already. But I will share what has worked well for me.
I started using cardboard, wrapped in foil and taped on really well. This way you can simply move the piece when you want to, it's durable and it insulates while holding in humidity.
Then, I started using 1/2" foam board insulation. It is super helpful to maintain temps and humidity. It is foil wrapped, so I put the foil side down and it keeps humidity inside the enclosure. I actually wrap the backs, sides and tops of my glass enclosures in it. This holds heat in, so requires less artificial heat, which zaps humidity. It also provides the security the snakes, BPs especially, crave.
Oh, and towels are absorbant, so will actually draw humidity put of the air if they aren't already damp or wet.
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