Uni-Stretch is a 270D nylon thread easy to compress and lays flat on a hook shank. Uni-Stretch has a wide range of uses from the cheeks on buzzers to smooth tapered under bodies on nymphs and dry flies. Use as a floss alternative on flies like steelhead or soft hackle flies and a good option to build bulk if needed. Comes in 23 colors and 30 yards to a spool.