Details NATTCOOL™ fabric: 92% Microlyocell from eucalyptus and 8% Elastane/ Lycra Flat ergonomic seams and slightly front placed side seams mean that you have a minimum of friction at night Tagless design, all care instructions are printed in the men's cooling sleep shorts Care Wash up to 40 degrees Celsius. Do not tumble dry. Do not bleach. Do not dry clean You can also find the care instructions printed on the inside of your cooling pajamas shorts Learn to care for super-fine natural fibres in our care guide