they're blue closed cell foam pads roughly 20x72"x 1/2" thick.
I currently use a piece of reflectix radiant barrier under my bag - it's 24" wide and weighs nothing, but you'll still need a good bag to sleep in. It replaced a self-inflating mat in my kit - which I still tend to carry with as a "just in case" or loaner.
I know several people who use a mil-surp MSS (2 nested bags and a gore-tex bivy) in their hammock for winter, another buddy who uses a poncho liner and space blanket for his underquilt and another poncho liner over his structural ridgeline under the tarp as a "tent".
my first hang was one of these December outings - I used the self inflating pad, a 40 year old military surplus bag, and an 8x8 tarp set up as a diamond. slept in sweats, thick wool socks, and a fleece quarter zip - and was plenty comfortable.
Trick I've learned since is to sleep wearing an insulated "patrol cap" with rigid bill (sort of like a ball cap with ear flaps) - head stays warm and the bill maintains some breathing soom so I don't feel smothered when burrowing in the bag when the wind picks up around 4 AM.
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