X-BIONIC and X-SOCKS garments use special yarns to enhance your performance under all conditions, the following instructions should be followed to maintain these features: We recommend washing your X-BIONIC & X-SOCKS garments at 30°C or 40°C on the lowest spinning cycle setting exclusively with sports detergent. Please avoid using bleach, conditioners or softeners, as well as tumble drying your garments. For wool products, such as our Merino line, we recommend using special wool detergent. Please avoid washing the garments by hand as the mechanical force may also damage the yarns. We also recommend using the wool or handwash setting of your washing machine with the lowest spinning cycle setting.