Bamboo charcoal pillow is filled with bamboo charcoal granule which was made of over 5 years natural bamboo, in a special technics procedure, it is breathable but not leaking. Advantages, Its extraordinary high density and porous structure makes it to have the advantages like moisture-absorption, deodorization, sterilization, anti-mildew, releasing the negative ions that for a better frame of mind, emitting far-infrared to improve the blood circulation. It can also improve the blood circulation of neck to prevent any neck diseases. Usage, Sun it once a month or two for effectiveness