Backing: Fish with confidence knowing you have Orvis fly line backing on your reel. When you want the best or need the ultimate in durability and capacity, choose our gel-spun backing. When you simply need a well-performing, basic backing material, our Dacron backing fits the bill perfectly. Gel-spun backing is ideal for big game anglers who need more capacity for heavier fly line. Gel-spun backing has minimal stretch and maintains 100% of its strength while in the water. Attach your fly line to either high-viz backing or plain white backing before venturing out on your next angling adventure.