insole

The inner sole of a shoe or boot.

An extra strip of material put inside a shoe for comfort or protection.

The inner sole of a boot or shoe: opposed to out-sole. See cut under boot.—. A thickness of some warm or water-proof material laid inside a shoe.

The inside sole of a boot or shoe; also, a loose, thin strip of leather, felt, etc., placed inside the shoe for warmth or ease.

The inside sole of a shoe or other footwear

the inner sole of a shoe or boot where the foot rests