From the designer, Devin Olsen:

As its name suggests, EZ Egg Yarn is a unique material for tying egg patterns. Unlike other egg yarns, the material collapses with current underwater. Taking advantage of this property, I decided to put a bead behind the material. Any time the Tungsten Taco Egg sinks or faces into current, the material folds around the bead and hides it while the bead simultaneously helps maintain a round egg shape. Anytime there is a strong egg bite, its the first pattern I reach for in the box.