noun
A removable insert placed inside a shoe for comfort, support, or fit adjustment.
新しいインソールを入れたら、靴がずっと履きやすくなった。
After putting in new insoles, the shoes became much more comfortable.
和語 for insole; more traditional and often used for simple flat inserts, while インソール often implies a modern, shaped, or functional product.
Borrowed from English 'insole'.