Dual core mattress

Abstract

A dual-core mattress with removable and replaceable components of different firmness which can be configured to have different heights and which allows the cover to be removed and washed. The upper portion of the mattress can be removed and replaced.

What is claimed is: 
     
         1 . A dual core mattress, comprising:
 a) a removable upper cover having an upper surface, a lower surface, and an upper cover zipper portion, wherein the upper cover zipper portion extends around the lower periphery of the upper cover on a lower peripheral edge of the upper cover and includes downwardly extending zipper teeth;   b) an upper mattress layer below the upper cover, the upper mattress layer having an upper surface and a lower surface; and   c) a bottom mattress layer below the upper mattress layer, the bottom mattress layer having an upper surface and a lower surface, wherein the bottom mattress layer further comprises:
 (i) a waterproof material on the upper surface of the bottom mattress layer; 
 (ii) an upper positioning zipper portion attached to an upper strip tape extending around the periphery of the bottom mattress layer at an upper end of the bottom mattress layer, the upper positioning zipper portion comprising upwardly extending zipper teeth; 
 (iii) a lower positioning zipper portion attached to a lower strip tape extending around the periphery of the bottom mattress layer below the upper strip tape, the lower positioning zipper portion comprising upwardly extending zipper teeth; 
   wherein the upper cover zipper portion can be removably secured to the upper positioning zipper portion when the upper mattress layer is positioned on the upper surface of the bottom mattress layer, and wherein the upper cover zipper portion can be removably secured to the lower positioning zipper portion when the upper mattress layer is positioned on the upper surface of the bottom mattress layer, thereby allowing the dual core mattress to be have two different vertical heights.   
     
     
         2 . The dual-core mattresses of  claim 1 , wherein the upper mattress layer and the lower mattress material have a different firmness. 
     
     
         3 . The dual-core mattresses of  claim 1 , wherein the upper mattress layer and the lower mattress layer are formed from different materials. 
     
     
         4 . The dual-core mattresses of  claim 1 , wherein the upper mattress layer comprises two separate pieces. 
     
     
         5 . The dual-core mattresses of  claim 4 , wherein each piece of the upper mattress layer is formed from a different material. 
     
     
         6 . The dual-core mattresses of  claim 4 , wherein each piece of the upper mattress layer has a different firmness. 
     
     
         7 . The dual-core mattresses of  claim 4 , wherein the upper mattress layer pieces each comprise a material selected from the group consisting of gel memory foam and natural latex cotton. 
     
     
         8 . The dual-core mattresses of  claim 4 , wherein the upper mattress layer pieces each comprise a material selected from the group consisting of gel memory foam and natural latex cotton. 
     
     
         9 . The dual-core mattresses of  claim 1 , wherein the bottom mattress layer comprises a high-resilience foam, chain net springs, or pocketed coils.