I use a piece of an Evazote pad
I got from Canada. It's yellow and is a bit thicker than the thin Gossamer Gear pads. It's a generous butt pad in camp and big enough for lower legs and feet in hammock with Phoenix UQ. The source is Mountain Equipment Coop. They sell a range of thicknesses. I think I have the 6 mm, which is about a 1/4 inch.
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