Features a large, stable underarm cradle for security and strength. Spring Assisted Shock Absorber absorbs negative impact energy and returns the energy positively, assisting the forward motion. Reduces pain and secondary injury to wrists, forearms, shoulders, elbows and back. The Ergonomic Handle is angled 2° to fit the natural position of the hand in a relaxed position along the side of the body. The third metacarpal aligns with the radius bone. The crutch position requires a 15° bend in the elbow, leaving a 12° downward angle for the hand position in a natural alignment. This angle leaves the wrist in the “open” position, maximizing blood flow and nerve conduction. Eliminates numbing and tingling in the fingers and forearm. Reduces carpal tunnel syndrome. Folds flat; can be easily stored under a chair at a restaurant, or in the overhead compartment of an airplane. Weight capacity is 400 lbs. Short floor to handle 21" - 28.5" (8 height positions). User height 3' 6" to 5'. Tall floor to handle 28" - 40" (13 height positions). User height 5' to 6' 4".