The core of these mattresses consists of Bonnell springs – classic wire springs interconnected by spiral flexible steel wires. Each spring is heat-treated, which ensures high durability and quality, as well as treated separately to maintain elasticity and prevent breaking. Bonell springs react to pressure progressively, in accordance with the increase in load. The cores made of Bonnell springs are very durable, while the comfort and other performance of the mattress is determined by the materials with which the cores are coated. The main advantages of mattresses with a wire core are stability, strength and durability. They are recommended for people who want a peaceful dream and comfortable sleep, but they are equally good choices for fitting out hotels and other accommodation facilities.