a separate part of a whole

an animal skin made smooth and flexible by removing the hair and then tanning

a piece of leather forming the back of a shoe or boot

piece of leather that comprises the part of a shoe or boot covering the heel and joining the vamp

a piece of leather across the instep of a shoe

piece of leather or synthetic material that forms the part of a shoe or boot above the sole that encases the foot

piece of leather forming the front part of the upper of a shoe