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

In a sneaker insole, an auxetic gel or rubber foam might better cushion the foot when it strikes the ground.

From Science Daily • Jun. 4, 2024

Though Adidas would have to avoid using Ye’s image and likeness and strip the Yeezy branding, it wouldn’t be noticeable since most of the branding is on the sneaker insole, where people can’t see it.

From Washington Post • Oct. 11, 2022

The durable boots are made of natural rubber with a comfy cotton insole and come in a variety of splashy colors that will light up dark days.

From Seattle Times • Dec. 4, 2021

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

From "Glitch" by Laura Martin