Cortland Trout Boss HTx Precision Floating Fly Line Complex new taper with a thinner core New proprietary heat-tempered surface treatment (Htx) The new Htx coating seals out dirt and oils while maintaining an exceptionally low friction coefficient Trout Boss HTx casts tighter loops, shoots farther, floats higher and is even more durable than its predecessor The taper combines a 456" head with 10 of level line thats slightly thicker in diameter than the running line for better management