Barred Sexi-Floss is a small spanflex material with barring, great for legs, antennae, ribbing, etc. These do not rot like rubber, giving you long lasting legs for your fresh and saltwater bugs.This product is perfect for making a variety of unique wrapped bodies, legs, and antennae. The Montana Fly Company Barred Sexi-Floss is made from dyed spandex fiber that's resistant to UV rays and won't rot over time. The variety of colors and speckled effect help you to build flies that no fish can resist.