Among the various components that determine quality in a mattress, springs play a primary role. Bonnell type springs are known to offer top performance and comfort. The use of Bonnell springs is recommended for those who prefer sleeping on spring mattresses over other solutions.This technology is also extremely useful in beds where the frame design prevents or reduces correct air flow. Each hourglass shaped coil is made of patented spring steel wire that has been subjected to quenching to make it non-deformable. Springs are assembled with a helical, a tightly coiled steel wire, which guarantees perfect cohesion and optimizes the combined action of the springs.