The Keen Navigator Underarm Crutch is an axillary crutch designed for use by individuals with walking, mobility, or lower extremity disabilities or amputation. Thes crutches feature shock-absorbing technology with a solid core polymer shock system. Other features include a contoured underarm support, a micro-adjustable handle with 360-degree rotation with unlimited vertical adjustment and an ergonomic hand grip, and a Keen Adventure tip (see also separate entries)that flexes 30 degrees for increased surface contact. OPTIONS: Silencer bolts, under arm replacement covers, replacement hand grips, and replacement underarm units. SIZES: Youth (for users 4 feet, eight inches tall), adult (for users 5 feet, 3 inches tall to 5 feet, 10 inches tall), tall (for users 5 feet 10 inches tall to 6 feet, 5 inches tall), and extra-tall (for users over 6 feet, five inches tall). CAPACITY: 300 pounds. COLOR: Black.