Staying warm on a cold shift is not about one thick layer — it is about three working together: a base that moves moisture, a mid layer that traps heat, and a shell that blocks wind and snow.

Base: a moisture-wicking layer keeps sweat off the skin so you do not chill the moment you stop moving.

Mid: fleece or light insulation traps body heat. This is the layer you shed and add as the work rate changes.

Shell: an insulated coverall or jacket blocks wind and locks the warmth in. Add a balaclava and insulated gloves and you are covered head to hand.