The TRG SynQuilt Alpine is a synthetic sleeping quilt made custom to your size.
With the improvements in materials over the last few years I've personally made the switch from down to synthetic in all of my gear. This was entirely for the ethical reason of sourcing down as well as the constant moisture management battle to keep my down gear from wetting out and becoming useless. Classic story heard many times over.
Approx temp limit of - 15c