Riverbyland Iron On Patches Fierce Tiger Pack of 3 Fabric Patches Size: 8x8.5 cm Use: iron on patches. The back hot melt adhesive is pro-environment. Suggestion: sew on after iron makes patches more firmly. Can be sew or iron on patch to cloth, jean, jacket, T-shirt, cap and etc. Washing: easy to use, easy to clean. Gentle cycle or hand washing is best. Do not use hot water.