Care Instructions: Ideally, you should hand wash and hang-dry your Cloud Sleep silk products to ensure maximum lifetime. However, our 22-momme silk is durable and can be machine washed on gentle/delicate in cold water, but never use a machine dryer, always hang-dry, and never bleach! Make sure to always use a PH-neutral liquid detergent and/or fabric softener otherwise silk can harden from acidic or alkaline detergents. DO NOT wash in warm water as pure mulberry silk will not react well. Be gentle to your Cloud Sleep silk products, and they will return the favor!