Summer time was the inner and liner only.
If you were humping it, then it was the air mattress or later the self inflating mattress. If you were mechanized, then a 3" thick foamy (foam with a canvas cover sewn over it) was the order of the day. I still have mine, and coupled with a cot is as comfortable as any mattress I have ever slept on.
Regarding the self inflating mattress, an evening with some soapy water and the patches ensured you did not wake up in the morning with your hip touching the ground through the mattress. Surprising how many holes you would find in them.
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