IPA: /ˈɪn.soʊl/
KK: /ˈɪnsoʊl/
A piece of material placed inside a shoe to provide comfort, support, or warmth to the foot.
I replaced the old insole in my shoes to make them more comfortable.
Insole → It is formed from "in-" (meaning inside) and "sole" (from Latin "sola", meaning the bottom of a foot or shoe). The word "insole" refers to the inner part of a shoe that is placed under the foot.
Think of the 'inside' ('in-') of a shoe where the 'sole' is located — that's what an insole is.