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

1850–55; in + sole2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
insole (ˈɪnˌsəʊl)
1.  the inner sole of a shoe or boot
2.  a loose additional inner sole used to give extra warmth, comfort, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
When officials searched the aspiring spy, they found a paper tucked under the
  insole of his right shoe.
If you have a high arch, buy a shock absorbing insole.
Inserting a high-quality insole will add additional comfort.
Canvas upper, soft leather insole, eva sole with textured bottom for improved
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