Used for about 2 years. A lumbar support cushion made using materials that utilize Phiten's water-soluble metal technology (Aqua-Titanium). Fabric using Phiten's water-soluble metal technology (Aqua-Titanium) is sandwiched between the outer fabric and the inner material. "Aqua-Titanium" is titanium dispersed in water at the nano level using Phiten's water-soluble metal technology. Using products that utilize this technology supports the body in a relaxed state. In addition, the inner material uses high-density, low-rebound urethane that firmly envelops the body. Its compact size allows it to be used not only in the car but also in various situations.