Originally Posted by
dejoha
+1 on the under quilt or closed-cell foam pads.
A lot of first-timers (myself included) experienced Cold Back Syndrome when trying to sleep in just a sleeping bag in a hammock, and wondered, "why is my n°-rated sleeping bag not working!"
On the ground, you've got conductive heat loss: the ground sucking heat away from your body. Often a small bit of insulation can prevent this, but you still need something to keep the ground from pulling the heat away. A pad works wonders on the ground, mostly for warmth.
An air-filled mattress has a similar problem to a hammock: convective heat loss. Convective heat loss is where the wind/air blows the heat off you. A bonus for hammocks when it's hot out. A horrible realization in a hammock when it's cold out. A pad works to prevent this, but under quilts work a bit better in terms of full shoulder protection, no pad slippage, and more "natural" comfort from the hammock (a pad can prevent some of the form-fitting properties of a hammock to work).
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