Independent Quality-Assurance Tested to Highest Safety Standard: Voluntary compliance to ULs inversion table safety standard makes Teeter Hang Ups the only inversion brand with certified quality. ComforTrak Bed: Built for the benefits with a pressure-reducing design that maximizes comfort and flexes with the user to enhance joint mobilization. Its innovative track design accommodates the optional Adjustable Acupressure Nodes and Lumbar Bridge accessories Grip-and-Stretch Handles: The ComforTrak bed and A-frame both feature built-in inversion grips for added stretching and decompression.