A viral debate recently broke out online over a surprisingly curious topic: the mysterious line on bath towels. While some joked it was a “face/butt divider” or “racing stripe,” the real answer is more practical.  That line is called a dobby border — a woven strip near the ends of the towel. It’s not just decorative. It serves several key purposes: Strengthens the towel to prevent fraying Improves absorbency while keeping the towel lightweight Maintains structure to avoid bulky edges Adds a polished, elegant look Helps with folding and hanging So next time you see those lines, remember: they’re designed for durability, function, and style — not just looks