This Microfiber Mattress Topper is  encased in a 100% cotton cambric shell. The topper is placed on top of the mattress. The elastic corners make it easily attachable and detachable. There is a layer of microfiber at the base of the mattress topper for firmness and a layer  on the top for that luxurious comfortable feeling. Double 135 x 190cm King 150 x 200cm Super King 180 x 200cm