Below about -5°C, dressing stops being a style question and becomes an engineering one. The capsule still works, but the constraints are physical.
Three layers, and the middle one matters most
Insulation is trapped air. The mid layer is where that happens, and it is the layer people most often skimp on.
Cotton is the wrong base layer
It holds moisture against skin and then conducts heat away. Merino or synthetic only, next to skin.
Extremities decide comfort
Hands, feet and head lose heat fastest. A good hat and proper gloves do more than a heavier coat.
Where to focus
Where to focus
- 2 merino base layers, top and bottom
- 2 mid layers — fleece or heavy wool
- 1 insulated, windproof outer
- Insulated waterproof boots
- Wool socks, several pairs
- A hat that covers the ears
- Gloves rated for the actual temperature