Bulve.zip -

: A straight zipper placed on a curved seam, such as the lower back, often creates a bulge because it doesn't follow the natural "S" curve of the spine.

: Occurs when a rigid zipper is sewn into stretchy fabric (like jersey or spandex) without stabilization. bulve.zip

Based on your query, there appears to be a slight typo. You are likely looking for information regarding (sometimes referred to as zipper puckering) or possibly bulve , which is an older term for certain types of bulb vegetables or specialized anatomical structures. 1. Zip Bulge (Zipper Puckering) : A straight zipper placed on a curved

: Shaping the center back seam of a pattern to match the body's curve rather than using a straight line. such as the lower back