Foldable Crutches: Heinsy crutches can fold up easily, perfect for traveling or putting under the desk,designed for both children and adults,adjustable height from 4’11” to 5’6″, with adjustable underarm and leg tubes, to assist with walking and reduce pressure on injured body parts. Soft Underarm Airbag:This floldable crutches come witha soft inflatable airbag under the arm.You can adjust the amount of gas in the airbag freely to achieve the most comfortable state, which solves the pain points in your armpits when using crutches.