Over the course of time, mattresses have constantly evolved. In the beginning, people used whatever you could put underneath you to provide any comfort other than a hard surface, This included, among other things, grasses, fronds, and furs.
As we became less nomadic, the practice of creating your sleeping area every night changed to having a pre-constructed sleeping surface. Jump ahead to the industrial revolution and steel springs were added to provide a kind of feedback to your body. Over the course of the next 2-300 hundred years, there was great refinement in spring technology as well as the padding over the springs.
In the late 20th century, pure foam mattresses were designed to eliminate the need for steel springs. First was a pure latex style foam and not so long afterward, visco elastic memory foam. Mattresses were not done evolving. People tried everything including water filled, and blow up (inflatable) designs.
In the 21st century, the next significant innovation was cooling technology. While many concepts were tried, What eventually prevailed was gel infusion technology. The concept being that the gel wicks heat from the body and disperses it through the mattress.
we have three excellent technologies, spring feedback
support, pure foam, and gel infusion. A hybrid
mattress is the successful combination of all three
concepts. While a little more expensive, the end result is
well worth it.