While helping put together a rummage sale, we came across a pair of ladies high heeled shoes. We cleaned the shoes of any paper, so the possible buyer could easily slip the shoes on checking for comfort.
This particular pair of shoes had, what we thought was, a pair of short intersoles in it for catching perspiration from the previous wearer's (arch area of the) foot. Not till we removed it, did we realize it wasn't an innersole after all, but a ladies' feminine pantiliner.
It worked well as it had the adhesive strip on the bottom for a non-slip pad for the foot. What an innovative idea! Ladies know that pantiliners are inexpensive anyhow, especially if found on sale and maybe purchased with a coupon. Pantiliners are much are far cheaper than innersoles of any brand name.