THE TEETER FitSpine FX2 sets the standard in comfort with patented wrap-around Ankle Cups for support , while the Comfortrak bed optimizes stretch with smooth surface and flexible, countered shape. Grips in the bed and frame provide additional traction and stretching options. Teeter precision rotation gives you complete rotational control with just simple arm movements for easy return upright! EXPERIENCE THE TEETER DIFFERENCE: Teeter is the only FDA-Cleared inversion table on the market indicated for back pain, herniated disc, sciatic, and more!