Anatomical spring carcass structure, Bonel system with 2.3mm tempered steel wire springs. Filling in polyurethane foam and acrylic fiber canvas with 1400 gr / m2 thermo-bonded felt plate. Top cover in strech fabric with continuous embroidery and sash with jaquard fabric. Sanitized treatment (antiallergic, antifungal, anti-mite and antibacterial).