When selecting an Air Walker, prioritize the frame material and thickness; high-quality units should use heavy-duty steel tubing with a thickness of at least 1.5mm to 2.0mm to ensure stability. Check the maximum weight capacity, which should ideally be ≥250 lbs (110 kg) for residential use and ≥350 lbs for light commercial grades. Additionally, verify the pedal design, ensuring they are extra-wide and non-slip to prevent user injury, and confirm the inclusion of high-density foam grips for ergonomic comfort.