The insole is a layer of material shaped to the bottom of the last that separates the upper from the lower.  The insole is sandwiched between the outsole (and midsole) and the sole of the person’s foot inside the shoe.  The insole matches the curves and contours of the bottom of the foot, eliminating gaps to improve comfort [1].

The majority of insole boards are made of cellulose and are treated with additives to inhibit bacterial growth from constant contact with the foot. Athletic shoewear will often have a sockliner, a piece of material placed over the top of the insole board (glued in position or removable.) [1,2]


Shoe insoles are also referred to as “shoe inserts”, typically can target and treat specific foot conditions such as low arches or overpronation.







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