This full-body massage chair is the best-selling one in the US. With advanced 3 D technology and ergonomic SL-track design, the Massage distance is 135 cm, makes you enjoy a personal massage from the head to the leg, helps to maintain the human body vertebra "S" shaped curve, achieves relaxing the spine, and relieves tense muscles. Auto Massage Modes 6 to 8 techniques, you can freely adjust the speed, width and intensity. According to different body heights, the calf rest frame can extend freely, the maximum extended length can be up to 20 cm, to make sure the full body can get for fitting massage. For long-time workers, people with back and back pain, etc, massage can alleviate physical fatigue, relieve pain and help improve sleep. This massage chair is 100% tested for performance and reliability before shipping.