Every massage chair uses two main components to deliver therapeutic full-body massage: Airbags and Rollers. An “L-Track” is a roller system that begins at the top of the neck and travels down to the lower back then continues to wrap under the glutes and hamstrings, almost in the shape of an “L”. You can get an amazing stretch from an L-Track chair thanks to the engineers who have managed to develop intelligent stretching techniques that use airbags to hold your shoulders in place and grasp your ankles as the chair bends into a stretch position. For more advanced stretch capabilities, some chairs use a hybrid of both S and L roller tracks to deliver a deeper full-body stretch. For its range of versatility and wider coverage, it's no wonder most Top-Selling Massage Chairs use L-Track technology.