4.5/5 Deducting 0.5 for ventilation complexity and overheating risk in mild weather.
→ Excellent choice for static cold-weather activities (e.g., belaying, camping). For high-exertion use, ensure the shell has pit zips or breathable panels.
→ Consider carefully. If your walls are inaccessible or budget is tight, focus on air sealing and attic insulation first.