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

Featuring a western-inspired silhouette with belted accents and a wide insole for maximum comfort, the calf-length Santiago Boots are no exception.

From Los Angeles Times • Oct. 20, 2025

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

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

Sustainably made from recycled plastic bottles, natural cork, harvested algae foam, EVA and 100% organic cotton laces, they’re vegan, ultra-light and comfy, with a removable insole.

From Seattle Times • Nov. 12, 2021

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

From "Glitch" by Laura Martin