Sew on patches are good for jackets and bags. We always recommend sewing patches on jackets with a sewing machine. Iron on backing does not work on leather, nylon, sating or similar materials. You cannot use large sized iron on patches on jackets or vests. In this case, you need sew on patches. We do not add anything special on our sew on patches. We make sew on patches for jackets, vest, dress shirts, polo shirts, towels, and bags.