The TX Pro employs triple-injection molding in the foot to achieve different stiffnesses in different places (bellow, torsion bars, shell/cuff), so that the bellows flexes ideally for telemarking while the boot is as rigid as possible elsewhere. It also uses more substantial torsion frame that wraps from the back of the foot around under the forefoot for maximum lateral stability. Triple-injection Technology Triple-injection foot / Bi-injection cuff = dialed performance Torsion Bars Refined Torsion Frame for maximum lateral stability. Tongue Pivoting Tongue makes getting in & out easy Edge Guard protects bellows.