DEAL orthopedic mattress with bonnell spring system support system, number of 416 BONNELL springs in the dimension 160x200. The springs are made of high carbon steel. Layered layers of foam materials on both sides of the mattress that provide the ideal conditions for a restful and refreshing sleep. High density foam around the perimeter of the mattress ensures support and stability. All materials are anti-allergic and hypoallergenic. Perimeter foam reinforcements that prevent the deformation of the mattress. Handles for easy rotation of the mattress at regular intervals.