I wrote to DD Hammocks and Nick, who I think is the owner of DD Hammocks, replied with the following about the underblanket:
The size is 2.15m by 1.5m (at the middle/ widest point) and the fill is indeed synthetic. This is a quote straight from Snugpak "The fabric is Paratex Lite and we use our Softie 9 sleeping bag fibre for the filling." I hope this helps.
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