It began as a simple question online — why do towels have those odd horizontal lines near the edges? Within hours, social media was filled with theories. Some joked they were “face-to-bath separation lines,” while others called them “racing stripes” designed to make towels dry faster. But behind the humor lies a surprisingly practical truth: those mysterious lines actually serve a useful purpose.

They’re called dobby borders, and they’re much more than decoration. Textile experts explain that the dobby border is a specially woven section added to towels to strengthen them and prevent fraying after repeated washing. Since towels endure frequent laundering, their fibers can easily stretch or unravel. The dobby border reinforces the fabric’s structure, helping it stay absorbent, soft, and balanced in thickness without becoming bulky.

From a design standpoint, the dobby border also provides a neat, polished look to both ends of the towel. It’s practical too — those straight lines act as visual guides for folding, making towels appear tidy whether hanging in a bathroom or stacked in a linen closet. So beyond aesthetics, the border enhances durability, usability, and overall appeal.

The next time you reach for a towel after a shower, take a moment to notice those lines. They’re not random details — they’re smart design features that keep your towel strong, efficient, and elegant. It’s one of those small, everyday details that remind us how thoughtful design often hides in plain sight.