Those subtle lines near the ends of your bath towels are called dobby borders, woven into the fabric for both function and style.
They reinforce the towel’s edges, helping reduce fraying, stretching, and loss of shape after repeated washing and use.They also add a neat, decorative finish that gives ordinary towels a more polished, luxurious appearance.Because the border is more tightly woven and less absorbent, the soft terry-cloth sections are better for drying yourself.