I think it's probably fabric to protect the heels! If anyone knows, I'll give it to you^^ Please take a look at the actual product photos (꙳ᴗˬᴗ)" #msのshop's flea market Please take a look at my profile once ꕤ︎︎·͜· * Immediate purchase welcome, silent purchase at midnight OK◎ * Welcome to bulk purchases, feel free to comment * Free shipping! ・Because it is stored at home, it is priced as "defective"! If you don't mind, you can buy it "very cheaply"! ・Please understand that it is stored at home and will be shipped in simple packaging (⁎ᵕᴗᵕ⁎ )