Firmness sliders for bed bases

Stiffness sliders allow the adaptation of the bed base (with legs) to the user's needs. The sliders make the slat more or less elastic-soft in the central area of the pelvis depending on whether they are moved closer together or farther apart: if, for example, we consider the need for more support at the lumbar level, to improve the overall postural balance, we can act through the sliders to provide more resistance to that body district.