Ergonomic S-shaped backrest: Designed to match the natural arch of the human body, bringing you comfort and safety. The sauna back support conveniently leans against the heated plate at a slight angle to provide additional back support. SAFE NATURAL MATERIAL: Made of natural pine wood, this S-shaped sauna backrest is , fully reusable, recyclable and biodegradable. Size: 50x40cm. The is smooth and polished, free of burrs and debris, and provides comfortable contact with the backrest. Massage function - The hollow mesh design of the backrest can also massage the human body at any time, making the human body reach a relaxed and comfortable state. The sauna backrest can also be placed on the sofa for matching use. Anti-slip design - Both ends are wrapped with silicone to prevent the backrest from sliding. No assembly required.