Socks for winter boots and what keeps your feet warm

Short answer: Warm feet need room, not thickness. A thick sock in a tight boot presses the air out, and it is the air that insulates.

Room rather than thickness

Insulation comes from still air around the foot. If that air is pressed out by a sock that is too thick in a close fitting boot, the foot gets colder than with a thin sock. See all bamboo socks for men.

Dryness is the other half

A damp foot gets cold however much is around it. A material that moves moisture away therefore does more for warmth than another layer.

The length has to reach past the boot shaft

A sock ending below the shaft lets the edge rub directly against the skin. Choose a length that goes past it. See bamboo support stockings.

Two thin beat one thick

If there is room, two thin layers insulate better than one thick, because there is air between them. See all bamboo socks for women.

Frequently asked questions

Are thick socks warmest?

Not in a tight boot. If the air is pressed out, the sock insulates worse than a thin one.

Why do my feet get cold even in thick socks?

Because they are damp. A damp foot gets cold regardless of insulation.

How long should socks for boots be?

Longer than the boot shaft, otherwise the edge rubs directly against the skin.