Mattress

Abstract

A mattress includes a first end and an opposite second end arranged in a direction of the mattress. The mattress is configured to have a first firmness pattern suitable for side sleepers when the first end is used as a head end and the second end is used as a foot end, and have a second firmness pattern suitable for back sleepers when the first end is used as a foot end and the second end is used as a head end. The mattress has a firmness distribution which is asymmetric about a middle line of the mattress which is perpendicular to the direction.

What is claimed is: 
     
         1 . A mattress comprising a supporting layer defining a longitudinal direction and a lateral direction, wherein the supporting layer comprises a first section and a second section arranged in the longitudinal direction, and the first section comprises a firmness reduced region of which a firmness is less than that of other regions of the first section adjacent the firmness reduced region and that of the second section. 
     
     
         2 . The mattress of  claim 1 , wherein the firmness reduced region defines a plurality of holes. 
     
     
         3 . The mattress of  claim 2 , wherein the holes are void. 
     
     
         4 . The mattress of  claim 2 , wherein the holes are filled with material which is softer than material of the firmness reduced region surrounding the holes. 
     
     
         5 . The mattress of  claim 2 , wherein the holes extend in the lateral direction. 
     
     
         6 . The mattress of  claim 5 , wherein the holes pass through the supporting layer in the lateral direction. 
     
     
         7 . The mattress of  claim 2 , wherein the supporting layer further defines a thickness direction perpendicular to the longitudinal direction and the lateral direction, and sizes of the holes in the thickness direction gradually reduce from a middle of the firmness reduced region to opposite ends of the firmness reduced region in the longitudinal direction. 
     
     
         8 . The mattress of  claim 1 , wherein the first section defines a recess in which an inserter is received, and the inserter is made of material which is softer than material of the first section. 
     
     
         9 . The mattress of  claim 8 , wherein the supporting layer further defines a thickness direction perpendicular to the longitudinal direction and the lateral direction, and sizes of the inserter in the thickness direction gradually reduce from a center of the inserter to opposite ends of the inserter in the longitudinal direction. 
     
     
         10 . The mattress of  claim 9 , wherein the inserter has a triangle shape in a cross section perpendicular to the lateral direction. 
     
     
         11 . The mattress of  claim 1 , wherein the mattress further comprises a cover layer stacked on and covering the supporting layer. 
     
     
         12 . The mattress of  claim 11 , wherein the cover layer has a thickness which is less than that of the supporting layer. 
     
     
         13 . A mattress comprising a first end and an opposite second end arranged in a direction of the mattress, the mattress configured to have a first firmness pattern suitable for side sleepers when the first end is used as a head end and the second end is used as a foot end, and have a second firmness pattern suitable for back sleepers when the first end is used as a foot end and the second end is used as a head end. 
     
     
         14 . The mattress of  claim 13 , wherein the mattress has a firmness distribution which is asymmetric about a middle line of the mattress, the middle line being perpendicular to said direction. 
     
     
         15 . The mattress of  claim 14 , wherein the mattress comprises a firmness reduced region adjacent to the first end and away from the second end. 
     
     
         16 . The mattress of  claim 15 , wherein the firmness reduced region defines a plurality of holes. 
     
     
         17 . The mattress of  claim 15 , wherein the firmness reduced region comprises a recess and an inserter received in the recess, the inserter being made of material softer than material of other regions of the mattress.