16-18-20 cm high bagged springs from 300 springs per square meter. The springs are composed of a high-carbon wire and available in wire diameters from mm. 1.70 to mm. 2.20. The Big Pocket rest system enhances the functionality of the spring system within the mattress due to its spring geometry that can provide lift and coziness at the same time. The structure of this product is more compact thanks to the "Plus" system, two layers of anti-allergic polypropylene fabric glued to the support surfaces.