Emazon&reg; Car Bamboo Charcoal Breathable Seat Cushion Ventilated Office Chair Cover Mat,18 inches by 18 inches Bamboo charcoal healthy cushion, ventilated and dry, Made of Activated Bamboo Charcoal &sponge of high elasticity,longtime use can maintain hip, back refreshed Charcoal cushion can effectively control the temperature, adjust the humidity,Health Keeper, useful to relieve fatigue, quicken metabolism and prevent bacteria Backside skidproof design for more safe driving,Charcoal is a pure natural product and it is non-toxic, tasteless, no side effects Good choice for those who longtime use seats,auto seats,sofa,like office staff and driver,Especially suitable for drivers and office workers Size:Size: 45*45cm (18 * 18 inch)