... mattress topper. 2.this mattress inner spec as below: knitted fabric, high density foam,spring,size, T,F,Q,K. ... COIL* FOAM ENCASED ******************* M-NZ04-01 * COMPRESS MATTRESS* POLYESTER FABRIC* Φ2.2MM 6 TURNS BONNELL* ONE SIDED USED ******************* M-US33 ... HOTEL MATTRESSM-US60-01 * BONNELL COMPRESS HOTEL MATTRESS* FIRE RESISTANT COTTON FABRIC* 2 SIDED USE *******************