The durability of a mattress is
closely related to the type of foam used. The primary criterion for assessment is the
foam parameter, which is labeled by manufacturers. A universal foam parameter consists of a
letter designation (V, T, or HR) followed by a sequence of four digits, where the first two digits represent the density in
kg/m3, and the next two digits indicate the hardness in
kPa (kilopascal). In cases where the manufacturer specifies hardness in
N (newton), a
sequence of five digits is also allowed, which is becoming increasingly popular.
It is essential to remember that higher
foam density translates to its hardness. However, this has nothing to do with the
hardness of the foam, which is indicated by a different parameter. Therefore, during the
mattress purchase, it is crucial to demand detailed parameters that allow for a
proper choice based on solid data. Of course, the
type of foam is also significant in this parameter.
Foams with the highest durability are
HR foams, a relatively expensive type of foam with
open cells, allowing for air circulation. Air can be
removed from the foam under pressure, and upon getting up from the mattress, it is
pushed back inside, providing adequate dynamics. Here too, the
density of the foam is key to the mattress's long life.
On the other hand,
T foams are avoided as they are significantly less durable. They have
closed cells, meaning that air is
trapped inside foam bubbles. Lying on it causes pressure, leading to
bursting of foam bubbles, and consequently, the mattress collapses. Therefore,
closed-cell foams are strongly discouraged when aiming for a
mattress for years, not a short period.