Selected cotton and linen fabric, with a soft texture. It has a unique 180-degree stretch and lying flat function. Combined with a scientific leaning zone, it can fully conform to the body's curves for support. The high-density sponge filled inside is soft and snug, with good resilience and is not prone to collapse even after long-term use. Its base is made of stainless steel, which is solid and stable, and also has the advantages of anti-corrosion and anti-rust.