A dual-density mattress is a type of mattress that uses two different density levels in its construction, usually with the goal of creating an optimal combination of comfort and support for the sleeper.

The exact arrangement of these two densities can vary. In some cases, a higher density is used in the core of the mattress or in the base layers to provide additional support to the spine and other high-pressure areas of the body. On the other hand, a lower density is often used in the top layers of the mattress to provide a softer, more comfortable feel to the touch.

The choice of density depends on many factors, including the user's weight, preferred sleeping position, personal comfort preferences, and physical health, including issues such as back or joint pain. The advantage of dual-density mattresses is that they allow for these characteristics to be customized to a greater degree than single-density mattresses.

The Alba Original Mattress is a perfect example of a dual-density mattress. It is composed of a 100% natural latex top layer and a second layer of high resilience foam with 7 comfort zones. This combination of materials with different densities allows the Alba Original Mattress to offer both soft top comfort and firm support, ensuring optimal sleep quality for a wide variety of sleepers.