I had no clue Details

Step 17: Conclusion
So, what do the lines on bath towels actually mean?

They:

Reinforce structure

Prevent warping

Balance absorbency

Improve durability

Enhance appearance

Simplify manufacturing

What looks like a small design choice is actually a carefully engineered solution refined over generations.

The next time you dry your hands or step out of the shower, you’ll know: that simple line is doing far more work than it gets credit for.