100% Fluorocarbon line.  Transitional line by design.  As tournament anglers fish all seasons and varying water temperatures, the bottom cover of the lake will change color.  In the colder months the bottom cover will be free of moss, and the water color will generally be more of a blue color.  As the water warms, and the moss starts to cover the bottom the water color will start to turn green.  The area where the moss starts to cover the bottom is called the transition point or often called the seam.  The seam is where the fish stage-up to feed.  The unique blue, green color of the Hi-Class line was specifically designed to blend and match with the changing color's of each season, allowing the angler to successfully fish the seam all year long.  And a great deal at $15.00 retail.