Here is the answer: **DOUBLE SIDED ADHESIVE IRON ON PAPER is a type of craft interfacing that lets you “glue” two layers of fabric together using heat from an iron. HERE’S HOW IT WORKS: It has adhesive (glue) on both sides, with a paper backing on one side to stop it from sticking until you’re ready. You first iron the glue side onto your fabric scrap (with the paper backing still on). Once it’s cooled, you peel off the paper backing — and now the other glue side is exposed. Then, you place this