>>2452515Closed cell EVA mats, thickness depends on where you want to sleep. I bought a 1m x 2m x 4mm mat online and fold it, if the ground is hard or cold. Usually there is no need if you have soft, unfrozen forest floor.
There is a product called EXPED Doublemat Evazote. but you can buy a mat like that unbranded, and thus cheaper, elsewhere.
Unfolded it has R1.1, folded it's 2.2, which is enough for all year except below freezing.
