One of our electrical mattress frames, Evoluta 250 is a wood slat mattress frame that permits adjustments to the inclination of the head and feet. Support is provided by slats in beech plywood anchored to the frame with silent nylon supports. The queen size version is made from two independent frames, both fitted with stiffness adjustment sliders in the lumbar zone. This model also features a battery that serves to return the mattress to its level position in the event of a loss of electrical power.