MATTRESS FEATURES 375 pieces steel spring construction and foam support We create a stronger Mattress frame by increasing the amount of Bonnell spring and foam supported per square meter Standard density foam in 6 sections We support the seven sections of the Bonnell spring frame of your Mattress with foam to provide a more outstanding comfort. 6 cm high-density side foam We enclose the frame of your bed with 6 cm thick foam, in this way, your Mattress is protected against sagging and deformation when sat on the bedsides. 1200 gr/m2 Thermofelt hard felt We support the area between the Bonnell spring frame and upper Mattress foam with hard felt, in this way, the springs do not deform and damage the foam. 6 cm soft foam 1.5cm feather foam and 5high densityfoam The sleep section of your bed is supported with 12.5 cm layer foam for extra comfort.