Material: PP Characteristics: This product in accordance with the human body double back structure design, can be up and down around the trimmer, spring damping, so that the back cushion wings close to the human spine decompression, comfortable, while indirect massage waist and back Double back design helps to modify the spine, so that it is not the oppressed Human engineering design, reduce the lower back fatigue, lumbar pain, back pain, shoulder pain, fatigue and other functions of sitting posture Air hole design can let you in the car or office at the same time, the back can also feel comfortable cool This product can be placed in a car seat, office chair, sofa, which originally only for rest or work with the tools to become health massage chair This product uses the environmental protection material, no smell, no other mixed material, not to bring any negative effects on human body, please rest assured that the use of