The visco orthopaedic dog makes for a wonderfully comfortable mattress for your dog the core of the sofa is made of memory foam which gives your dog a soft and relaxing surface to lie on protects your dogs spine and joints and helps it to have a relaxing pain free sleep the orthopaedic memory foam adapts to your dogs body temperature and stays warm for extra comfort the unique material spreads your dogs weight across the whole mattress surface and once your dog gets off it always retur