Technical Features: (2.4mm) Heat-treated, anti-rust and drop-down. The frame of the steel wire surrounds the chassis of the sprocket to install the chassis against the pressure factors. A layer of cotton felt on both sides to increase the hardness of the mattress and prevent the sensation of the swast. Two layers of high density sponge of both sides free of calcium carbonate has a high flexibility. Knitting cloth weighing 180 g / m 2, embroidered with white sponge 8 ml handle against bacteria and bedding insects. Height of 28 cm 5 year warranty