Neither. It is NOT firm like a yoga mat, and looser than closed-foam. Think about a big old sheet of cotton, but much stronger. I can't describe it other than that. it stuffs like a fleece blanket. it is soft, and stuffable, but not compressible.
If you go to JoAnns and look at a sheet of polyester baton, it looks and feels like that, but holds it shape a bit better.
I stuff it loosely (not in a stuff sack) and stuff it down into the cracks and corners inside my pack. It is like a filler of sorts.
I hope that helps.
Plan Right and Pack Light
Author -12 Steps To a Lighter Pack
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