The UQ-IX+N+D : mutli-layer combo-IX+nylon+down UQ has worked well in varied appropriate combos. So . . . much fun to figure out ! !
That could also be said about the TQ-IX+N+D multi-layer combo.
Yet . . . . .
Oh . . . the luxury . . . it is quite fun to have a piece of gear, clearly . . . mainly . . . a deep winter piece of gear, TQ, the Burrow0*.
Oh . . . how warm and happy at 0* in the woods. . . luxury . . . . one . . downy one