Xtreme Monkey Platinum Inversion Boots - Pair Locking Mechanism heavy-duty, double-action locking mechanisms with built-in safety lever-and-loop locks Fights compression fatigue from jogging, aerobics, cycling, and other exercises Helps spread apart compressed discs and stretch back, neck, and shoulder muscles Pair of inversion boots for reducing back pain, spasms, and muscle fatigue Thick, contoured supports pads for a snug fit and superior comfort