The Helix is a very versatile option. This particular piece of furniture is built to last. The design and choice of materials focuses on upholstered furniture made to last for many years. The sofa contains cold foam in the seats, backs and arms. The frame contains Nosak coiled springs, with strong elastic webbing in the back. All the key frame parts are made from either solid wood or birch cross laminate. The chair also has an electric recliner function.