90x200 foam mattresses are one of the
most popular choices when it comes to single beds. Their incredible
versatility and comfort make them perfect for various age groups, essentially from children to adults. They are commonly used not only by teenagers and students but also by
individuals living alone. There are several main types of foam mattresses that are worth exploring to make an informed choice.
The cheapest ones are those made from
closed-cell foam, designated by the letter T. It can have different
degrees of density and firmness, which will affect their properties, but closed-cell structure will eventually
start breaking. This is because the cells in T foam are closed. Since there is
air inside the bubbles, every pressure on the mattress
increases the pressure within hundreds of thousands of these cells. As a result, they start
cracking very quickly, and the mattress begins to sag.
A
better choice for health and comfort is a mattress made of
highly elastic foam, denoted by the letters HR. In principle, it has
higher density, which increases its lifespan. It differs from
T foam in that it has bubbles with pores, allowing them to remain
open. Since it is an open-cell foam,
air can circulate within it. Pressure on such a mattress causes air to leave the mattress through the pores, and after
releasing the pressure, the air is pushed back in.
In the selling environment, mattresses that have a first layer of
viscoelastic foam are still popular. This is a type of polyurethane foam that, just like liquids, has a
viscosity giving it thermoelastic properties. This
sinks under the body in response to its natural
heat and pressure, which in marketing terms is presented as
healthy adaptation to the body's shape. In reality, however, this can lead to
improper spinal support, limit the ability to move, or cause sweating due to
airflow restriction. These drawbacks can be mitigated by using
memory foam in the second layer of the mattress, allowing for proper
body contouring on the mattress.