We recommend handwashing. Recommend using neutral detergent. Avoid using bleach or softeners as they may damage the fabric. Wash dark and light colors separately. Dissolve a mild detergent in cold water (86°F/30°C max) and fully immerse the Modal underwear. Gently press/knead it, then rinse (soak no longer than 5 minutes). If you prefer machine washing, please use a laundry bag designed for delicate fabrics. Please DO NOT put underwear in the dryer. THE HEAT WILL DAMAGE ITS SOFTNESS AND FIT. Lay flat to dry in a cool, shaded place OR hang on individual hangers. Avoid hanging wet Modal underwear by their seams, which can cause stretching.