Insul-Bright can be machine-washed and dried. You do not need to pre-wash the Insul-Bright insulation batting before using it for your sewing projects. Insul-Bright will not shrink or shift when washed. The material is breathable and will not break down with washing. Washing may soften it up a bit but will not break it down. Insul-Bright can keep its insulation properties even after multiple times of washing. Although it is advised to wash Insul-Bright in a cool setting, you can still wash it up to 40 degrees and tumble-dry using medium heat. If you need to iron your completed project with Insul-Bright, ensure it is placed between cotton battings and use a low heat setting.