Overlock thread is used for finishing, or overlocking, heavily frayed fabrics, as these would otherwise fray into the seam after several wears or washes, resulting in visible holes in the seams. It is thinner than regular sewing thread, yet very tear-resistant.

Overlock thread is used for finishing, or overlocking, heavily frayed fabrics, as these would otherwise fray into the seam after several wears or washes, resulting in visible holes in the seams. It is thinner than regular sewing thread, yet very tear-resistant.