Fly line backing serves two basic purposes. The first is to fill up your reel so that your fly line completes the filling of your reel to within, say, 1/8th inch of the spool capacity. The second is to still stay connected when a big fish strips of all your fly line!
A great backing for trout fishing.
Sizes Available: 20lb (100yds, 175yds, 500yds),
30lb (100yds, 175yds or 500yds)