Excellent special material (Features) Teijin fiber "Eco Pure (weak acidic ph-control polyester material)" is an excellent material that combines deodorizing, antibacterial, odor resistant, and stain resistant. Furthermore, Far Infrared Magnetite allows heat to circulate your body temperature and heat yourself with your own body temperature. [How to use] Wrap the eco pure surface inside and secure it with the Velcro fastener.