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A simple question has sparked a heated debate on social media: What’s the purpose of the strange line on bath towels? While it might not be a life-altering mystery, it’s certainly got people talking. Move over, viral dress debate—this is the latest internet obsession.

If you’ve ever wondered why your towel needs washing after just using it or questioned the purpose of those lines, you’re not alone. A recent viral post on X reignited the discussion, prompting a mix of jokes and serious guesses. Some suggested it was a “face/butt divider,” while others thought it was a “racing stripe” to speed up drying.

But the line, known as the dobby border, isn’t just decorative. It actually serves several important functions:

1. **Enhances Durability** – The dobby border strengthens the towel, preventing fraying and increasing its lifespan even after multiple washes.
2. **Improves Absorbency** – By maintaining the towel’s structure, the border helps it absorb moisture more effectively without adding bulk to the fabric.