Conybio FIR Socks (2 Boxes, 4 Pairs) are specially designed with high-density Bio-Ceramic and Negative Ions using the State of Art "Nano Technology". The quality of the Fabric has been improvised by the usage of this Technology to enhance the warm and wellness feeling. Conybio FIR Socks provide you with goodness of the Sun and conforms to supportive therapy. It is recommended for young aged, middle aged and elderly people.About FIR Technology:Far Infrared (FIR) is a subdivision of electromagnetic spectrum that has biological effects. It has been observed to stimulate cells and tissues which can prove to be promising in various conditions. Conybio FIR Socks are made out of bio-ceramic nano particles which, when come in direct contact with the body, generate FIR radiation, which in turn help in improving blood circulation and useful functions.The package contains 2 Boxes (4 Pairs) of Conybio FIR Socks (Black).Washing Method:Hand wash with mild detergent. Do not scrub with a brush or use harsh methods of cleaning. Do not squeeze, Only drip dry.