DRITZ-Replace worn or torn pockets in pants and slacks with these easy Iron-on replacement pockets. Pocket bonds to bottom of pocket for quick repairs. These Repair Pockets are cotton and require fusing. The fabric on to which it is fused has to withstand the high heat of the iron that is required to attach these. You would need to confirm this before trying these pocket repairs. These Repair Pockets are generally used to repair the side pockets of slacks.