The ZARIF double thread chainstitch technology offers innovations over traditional double thread chainstitch and lockstitch sewing methods. It forms interlocking loops between the top and bottom thread that are rotated 180 degrees. This decreases puckering and increases strength compared to lockstitch. ZARIF claims the rotating loops, along with tension control of top thread and drop feed, allow for tight, elastic, or reinforced seams without unraveling or bobbin changes. The technology could replace lockstitch and expand applications of chainstitch, but has not yet been commercialized.