"SL" Rail Design (GT700)

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The GT700’s advanced SL rail design is another feature that puts this chair in a class all its own. Much closer to the natural contours of the spine and hips than the S or L rails of past models, the SL rail exerts less unwanted bone pressure and more of the deep tissue relief and circulatory stimulation you need from a therapeutic massage. This industry-best 135cm long rail brings full roller massage and shiatsu functionality from the base of the skull to the top of the calves, for amazing integration with the pressure and kneading functions around the legs, feet, arms, and hands.

Reference: 

Kennedy, A. B., & Blair, S. N. (2011, October). Massage therapy for those who exercise: Amta. American Massage Therapy Association. Retrieved August 11, 2022, from https://www.amtamassage.org/about/position-statements/massage-therapy-for-those-who-exercise/#:~:text=CONCLUSIONS%3A%20Massage%20administered%2030%20minutes,swelling%20and%20range%20of%20motion.