It is constructed with our latest award winning Amphibio 4D technology, which assures greater edge grip and easy turning. The convex front section of the ski provides a more precise entry into the turn, and the Concave rear section guarantees a dynamic exit from the turn. Dual Shaped construction increases torsional stability and reduces weight, while RST Sidewalls provide excellent power transfer from the skier to the edges. Interra is designed to impress the most demanding skiers looking for dynamic performance in any condition. Lightskiing. Within every woman is a great skier.