The motor, operated by wired remote control, lifts the area of the head or feet, or both. The device, that blocks electromagnetic fields, makes it compatible with pacemakers. Shaped slats at head and feet sides: the mattress is supported throughout its length, without being deformed at the ends. The 70x25 mm frame is in varnished beech; beech slats are made in 38x8 mm plywood, finished with non-toxic products and coupled by SEBS” flexor fitting. The sliders adjust the level of rigidity in the area of the pelvis, acting on the joint boards in groups of three: two upper paired ones and a middle one below, to download the weight on a triangular structure. This system, called TWR, can easily customize the bed base bearing, according to the weight of the user, for a perfect comfort.