A shoe is an item of footwear.
Parts of a shoe
Sole
The bottom of a shoe, which supports the wearer's foot, is named the
sole. It usually consists of several layers, and is usually a separate piece from the upper shoe (though not always, as in the case of wooden shoes).
Insole
The insole is the interior bottom of the shoe, which sits directly beneath the foot. Many shoes have removable and replaceable insoles, and extra insoles are often added for comfort or health reasons. (To control the shape, moisture, or smell of the shoe, for example.)
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Athletic :: Footwear