How to Iron? Appliques and embroidered patches can be ironed onto anything you can iron: shirts, jeans, hats, pants, skirts, etc. (Iron on Patches Only) Make your backpack or tote unique! With an iron on you can create a new look instantly. It's so easy. Heat seal to polyester/cotton fabrics. Do not apply to rain wear (waterproof), highly elastic, rayon, nylon or tri-acetate fabrics. Once applied, applique is permanently attached to the garment and is washable, dry able and dry cleanable. For machine washing, turn garment inside-out before washing and drying.