Hemline Repair Fabric Iron On 33x12cm: Black. For repairing and reinforcing fine and medium materials, including voile, polyester, nylon and lightweight cottons. Iron on instructions: place fabric on firm surface, cut piece slightly larger than tear, set iron to wool setting and press for 20 seconds. Can also be used to repair neoprene dry suits, wet suits, waders, neoprene gloves and boots, orthopedic supports, and lycra body suits. Heat protection with reusable heat shielding paper. Machine washable. Stretch fabric for flexibility and comfort.