Antidecubitus cushion made of viscoelastic compact foam composed of a polyurethane gel layer with high absorption pressures and a layer of polyurethane foam. The combined action of the two layers ensures a reduction of the contact pressures and allows a significant increase of the support surface. The cover is antibacterial, waterproof, breathable and bielastic. This property allows a considerable reduction of the friction between the skin and the cushion.PL1000 is equipped with an anti-slip bottom to assure a safe and stable anchorage to the chair. Also available with a central hole.