The X-Shape STX is a scaled down version of the Supershape for the advanced to intermediate skier- nearly as much technology, much lower price. MTX denotes "short turn radius," and Intelligence Technology uses fibers placed in an argyle pattern in the core, in front of the binding. At faster speeds, vibrations are converted into electrical energy, and the forefront of the ski stiffens up. At slower speeds, the fibers stay limp, making the ski easier to manipulate and maintaining its ability to flex into its sidecut. Technology in the tail adds torsional stiffness when you need it. Available only with the PR 11 binding system.