Nanofibers are defined as fibers with diameters less than 1000 nm (nanometers). They produce a high quality bedding accessories and also provide an excellent support for your neck, head and shoulder while you sleep and give you a superior comfort. Cover : Luxurious Sateen Dobby 300TC Filling : Nanofiber Down Feel Size: 48 x 73 + 5 cm Weight: 1600gr Caring Pat regularly your Nano Fiber Pillow to replace the air inside with fresh air (eliminate odor naturally) Dry clean only at 40 C Make sure that the pillow is completely dry after wash before use. ORIGINAL 100% Happy shopping :)