innersole

plural innersoles

1. An insole; a cushioning layer lining the inside bottom of a shoe or boot.

   After his toe was severed in an accident, he had to buy orthopedic innersoles for his shoes.

   1 more example

   The slipsole is examined to determine whether it must be replaced or whether a patch is sufficient. Shoes which are worn through the bottom filler and/or innersole cannot be economically repaired.

   1943, War Department Technical Manual, volume 10, number 265, page 36