Uni Underbody is a thick 630-denier nylon thread designed to build up fly bodies with strength and stretch. This rugged material also doubles as a floss replacement or for tagging, simplifying workflows in tying sessions. The white color takes markers well for precise labeling on the body, wraps, and head area, improving visibility during construction and inspection. Each 30 yard spool provides ample length for multiple patterns and experiments, delivering consistent performance across season-long workflows. Its dense profile and natural elasticity help maintain shape under tension, reducing the need for rewraps.

• 630-denier nylon thread: thick, strong, and stretchy, designed to create solid, long-lasting body wraps that hold shape under tension.
• Versatile use: builds up fly bodies, doubles as floss replacement, or for tagging, streamlining workflow in one material.
• Color and visibility: white takes markers readily for clear labeling on flies, wraps, and finished patterns.
• Length: 30 yard spool provides extended use and fewer reloads, enabling more consistent work sessions.