To counteract the shifting of the fabric, there is a foot that is designed so that all layers feed evenly called by several names, a walking foot, a dual feed foot or an even feed foot. It is more than just a presser foot in that it has a two-part mechanical action that lifts the sole while the feeding mechanism on the foot moves with the feed dogs of the machine. It looks like it “walks” as it steps up over the fabric, instead of pressing and pushing on the top layer. here