Comfort and performance. A ski boot for good skiers that incorporates Twin Frame technology to provide the rigidity you need for greater control and enhanced responsiveness. This is combined with an unrivaled foot-hugging fit for optimum performance on the piste. PU bi-material lower shell and upper cuff construction. The 24mm oversized pivot reduces the interaction between the lower shell and cuff for outstanding precision and direct power transmission. The angles have been modified to optimize the foot position and provide better heel hold for increased precision and greater room. Sidas started by using Salomon's X-Pro 100 boot, and binned the standard liner, allowing us to select our own liner option. The addition of the Sidas Booster Strap ensures optimum hold of the upper cuff and tongue as well as easy tightening.