This product contains silk - please ensure gentle care with silk detergent. Wash only at the specified temperature and do not iron hotter than specified. A material mix of luxurious merino wool and silk plays the leading role in the tank top from the HANRO Woolen Silk collection. The temperature-balancing thermal underwear protects against heat and cold and can therefore be used in a variety of ways. The flat seams are an additional plus when it comes to wearing comfort.