Sleeping pads suck in hammocks, an underquilt is way better. Worst part about the pad is it is a vapor barrier where you don't want it.
The accessory to an underquilt is an impermeable silnylon undercover vapor barrier.>>2160391
Undercover is almost always necessary with any wind movement,
Underquilt is necessary below 70.
More underquilt means less sleeping bag/top quilt.
How well the underquilt fits your hang dramatically influences performance.