A foldable upright wheeled walker with adjustable armpit cushions and support frames that supports a sufficient user body weight to facilitate a natural gait and provide unassisted mobility for a wide range of mobility impaired individuals. The invention may be folded and unfolded for compact storage or transportation. The device includes large rubber tires on a caster wheel assembly and includes one or two mechanical friction brakes actuated at the levers attached to the handgrips on each side of the device. The user stands or walks within the polygonal footprint defined by the front and rear wheels with arms over the armpit cushions to provide upper-body support without resting significant weight on the user's wrists or arms or standing and walking stooped over, minimizing risk of falling.