insole

American  

[in-sohl] / ˈɪnˌsoʊl /

noun

1. the inner sole of a shoe or boot.

2. a thickness of material laid as an inner sole within a shoe, especially for comfort.

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insole British  

/ ˈɪnˌsəʊl /

noun

1. the inner sole of a shoe or boot

2. a loose additional inner sole used to give extra warmth, comfort, etc

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Etymology

Origin of insole

First recorded in 1850–55; in + sole ²

Example Sentences

Researchers have developed a new shoe insole technology that helps reduce the risk of diabetic foot ulcers, a dangerous open sore that can lead to hospitalization and leg, foot or toe amputations.

From Science Daily • Apr. 19, 2024

The reigning AL MVP said he’s been fitted with an insole for support.

From Washington Times • Jul. 15, 2023

Each pair also gets a custom insole, extra protection for the one foot he broke in high school and the other foot he broke as a freshman at UCLA.

From Los Angeles Times • Dec. 16, 2022

There will even be an insole with a nod to the movie “Bring it On” because Delle Donne had a crush on the character Missy.

From Washington Post • Jul. 9, 2022

I didn’t carry incriminating evidence around under the insole of my right shoe.

From "Glitch" by Laura Martin