The "walking foot" machine is often a term we use for machines that are equipped with a top, bottom and needle feed motion.  A walking foot machine can also be used on machines that do not have needle feed actions and so it's often very commonly intercommunicated.  Machines equipped with a top walking foot, bottom feed and needle feed action are also called "unison feed" or "compound walking foot"

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Walking foot machines are most commonly used on heavier materials because of the positive feeding action of the unison feeding

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• Pros:

  • Very strong feeding mechanism

  • Capable of walking across seams with easy

  • Useful for leather work, upholstery and heavier materials

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• Cons: 

  • Not appropriate for lightweight material

  • More expensive machines because of the extra parts and mechanics of the machine