SX stands for "Super" fast action. Using their newest generation Boron III material and design, Boron III-SX rods have significantly more power and strength than the MX and IIIx rods. These new rods have been specially designed to handle regular WF lines and the heavier style lines now available (Clouser, Magnum, Royal Wulff, etc.) in particularly windy conditions. These rods pick up more line off the water and handle the wind better than any fly rods according to Winston. In addition, Boron III-SX rods have beautiful new silver trip wraps framing the logo and differentiating them from other Winston rods. Available in the Winston trademark deep green with matte black guides to match the new matte black anodized aluminum reel seats. Each is engraved with "R.L. Winston Rod Co.", the Boron III-SX rods are easily distinguished as the most beautiful rods on the rack.