XO 100: Fly line par excellence The XO 100 is our most advanced fly line. XO has a thin and durable DuraSlim coating. DuraSlim enables us to manufacture a line with thinner running line than before without sacrifizing durability. It also features varying hardness coatings in different parts of the line; the head being softer allowing you to push arrow shaped tight loops and the running line being harder for carrying extra-long overhangs and ultimate shootability. The fly line has super small loops on both ends and clear markings of the line weight near the tip of the line. Phthalate free. Description: - Thin and durable DuraSlim coating - Varying hardness coating - Small loops on both ends - Clear markings of the line weight on the tip loop - Floating, Weight Forward line weights #3 - #8