Insole

Also Known As: Inner Sole

The term “insole” is used in several related but different ways to refer to a part of a shoe at the bottom of the upper, under the foot during wear.

In sneakers and other modern factory shoes, “insole” may refer to a footbed laid or glued into an upper on top of a lasting board or Strobel sock. Sellers of aftermarket insoles use the term in this sense.

In shoes made by older methods, “insole” refers to a layer of material, often leather or fiberboard, that is sewn to the upper. The insole is then connected to the bottom, either directly, as in stitchdown construction, or indirectly via a welt sewn to a holdfast or gemming on the insole. Layers laid on top of these insoles, such as to cover clinching nails, are called sock liners.

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