Abstract: An adjustable mattress has a comfort layer and support layer that are separable, replaceable and able to be arranged individually for obtaining the level of hardness and comfort most suitable to a user's desire. An adjustable mattress consists of a comfort layer, a support layer, uniting parts, and springs. The comfort layer is a surface layer on the mattress that can be made from materials of foam or latex or fiber or gel or spring, recycled foam, recycled latex (rebounded) or wrapped spring of various diameters and heights, support layer containing springs, wrapped springs or arranged springs inside the foam as parts of the support layer, the uniting part can be in the form of magnet and iron plate, zipper, button or Velcro placed in the comfort layer and support layer.

Abstract: A mattress with adjustable hardness and comfort levels includes a surface cover layer, a first comfort layer, a second comfort layer and a hollow space made of foam at the bottom. This mattress also provides the flexibility for consumers to change the first and second comfort layers in the mattress to achieve the most appropriate hardness level according to his body profile independently for the users on the left and right sides of the mattress. Thus, consumers may change the hardness and comfort levels of their mattress easily by changing the comfort layers according to their desires anytime.