A compromise — #23 of 31 Modal ranks #23 of 31 fabrics for warmth without weight. It is a middling fabric for this. Ranked on warmth relative to weight, with a packability bonus. The top pick is Cashmere.
Modal measures 72/100 for breathability, 13% moisture regain, 25/100 warmth, at 150 gsm. Warmth-to-weight is the metric: 25/100 warmth at 150 gsm is unremarkable for packable insulation.