Orvis Gel-Spun allows you to increase your backing capacity versus traditional braided Dacron backing and has become the choice of many big game anglers. Eliminating stretch while unaffected by UV radiation, salinity and other detergents, Gel-Spun Backing is constructed of a braided polyethylene resulting in incredible strength with extreme abrasion resistance. Because of its flat profile, backing "belly" is eliminated when fish make long runs.