The unique feature of a Pfaff is the IDT (Integrated Dual Transportation) added to selected Pfaff models in 1979, allowing home sewists to handle thick layers of fabric. With the exclusive IDT feature on a Pfaff sewing machine, you do not need a walking foot because you can feed your fabric through the feed dogs from both the top and the bottom simultaneously. The Pfaff brand of sewing machines has become a popular and trusted quality brand of sewing and embroidery machines in the market since 1980. http://www.dapsew.com/durkopp-adler-sewing-machine/adler-sewing-machine/