The backrest adopts a new high-quality Canadian hemlock with its clear and natural texture which brings better visual enjoyment. Canadian hemlock wood is strong and durable enough to withstand 300kg. Made of natural hemlock no chemical processing no painting you can use it with confidence. It is composed of seven Canadian hemlock wood of natural quality and the surface is polished and polished by multiple processes making it smooth and delicate. The fir on both sides plays a fixed role the structure is stable and the bending resistance is strong. The lumbar vertebrae curvature design of the backrest is consistent with the human body lumbar vertebrae curvature and conforms to the ergonomic principle. The backrest fits the curve of the back releases the pressure on the lumbar spine protects the lumbar spine physically and also ensures that the back does not directly touch the far-infrared heating plate of the sauna room. Let you sit at ease and relax. In addition this backrest is not only suitable for any sauna but also suitable for sedentary life in daily life. This product can be used directly without any installation steps. Size: 25.98 (W) x 17.72 (D) x 2.56 (H)