Natural fibers like modal are well known for it’s ultra soft textures. However, washing it too harsh may damage your undies. If you're worried about long term longevity, separate lights from darks, and wash separately. You can machine wash in warm water, preferably on the delicates cycle. Tumble dry on the lowest heat setting and remove as soon as they’re dry. We still recommend to hand wash your Undergram undies to preserve it longer.