BERKLEY XTFS4-15 (NEW) XL IMPR FS 4LB 330YD CLR XTFS4-15 The Best Trilene XL Ever! Stronger and Smoother than ever, the improved formula has 20% greater knot strength and over 50% greater wet strength. 20% more flexible, for smooth casting and maximum manageability. Smooth casting for maximum manageability Smooth Casting