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At the core of its operation, the double needles chain stitch sewing machine utilizes two needles simultaneously, which creates a unique stitching pattern that is both durable and elastic. This type of machine employs a chain stitch mechanism, contrasting with traditional lock-stitch machines. The chain stitch not only allows for greater stretchability, making it ideal for knit fabrics, but also produces a seam that can be unpicked and reapplied with relative ease—a significant advantage in garment construction where adjustments are often necessary.

A specialized zigzag presser foot typically features a wide groove at the bottom. This groove allows the needle to move freely from side to side without obstruction when creating the zigzag pattern. Additionally, many zigzag presser feet have markings that guide seam allowances, making it easier for users to achieve precise stitching.