Any standard wood doorframe* can be your center for inversion with the EZ-UpTM Inversion System, which comes complete with the Inversion Rack and Gravity Boots. Without interfering with the normal use of the door, quick-disconnect locking brackets secure to the doorframe and allow the Inversion Rack to be installed in just seconds. The Gravity Boots wrap comfortably around each ankle, securing with adjustable, self-locking ratchet buckles. Easy-reach handles and comfortable foam handgrips allow for mounting and dismounting with ease. The double-bar system enables you to hang freely out and away from the frame - allowing for maximum mobilization during your inverted workout. EZ-Up Inversion Rack: Double-Bar System: Makes mounting and dismounting easy Quick-Disconnect Locking Brackets: Secures the rack to the doorframe, but allows for easy removal. Locking bracket is easily installed with screws (included) on the door frame High-Quality Finish: Scratch-resistant powder coating for years of use Door Savers: Protects the doorframe from damage while in-use Foam Hand Grips: For a comfortable and secure workout Gravity Boots: Available in Two Sizes: Standard and XL. XL diameter is 1\" larger and 1½\" taller than Standard (calf loops not included) Dual Self-Locking Ratchet Buckles: Unique double-lock system for added security Unparalleled Comfort: Super soft 5/8\" foam liners provide maximum comfort with minimal compression Flexible Shell: Made of light, highly durable DuPontT HytrelTM material for a comfortable fit Exclusive Calf Loops: Removable feature; places a two degree bend in the knees to help reduce the load on knee joints and the top of the foot Strong, Durable Materials: Hooks and calf loops are made of 40% glass nylon alloy, creating a stronger product Maximum user weight: 250 lbs (113 kgs) SPECIFICATION: Brand Teeter Usage Home Use Condition Brand New Warranty 5 years warranty