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The plan for the Pragelato Olympic hill facility for ski jumping includes: two Olympic standard hills (K120 and K95) with related start platforms, a heated building for the athletes, the judges' tower, a special ski lift facility (two-person chair lift with fixed clamp), a building to house the snowmaking system and power station, a programmed snowmaking system and night lighting of the Olympic ski jump hills, a multi-functional building (with attached stand for the public and including: a hotel/residence with accommodation for 100 people, a bar/restaurant for 100 people, a conference room for 200 people, gym, discotheque, technical and service rooms), three training hills (K60, K30 and K15). One of the criteria that inspired the plan was the desire to limit as much as possible visibility of the tracks with respect to the larch woods surrounding it, both for environmental reasons and because these trees constitute a transversal wind screen that is very important for practicing the sport. The out-runs were located in the area of a small saddle that characterises the slope and the in-runs, though higher than the ground, were designed not to emerge with respect to the upper part of the tops of the trees that line the hills. Although it is very difficult to conceal the characteristic shape of the hills in a natural mountain environment, an attempt was made to limit as much as possible the space occupied by the structure of the runs, and that of the other structures needed for the ski jump competitions. In particular, the heated building for the athletes was designed partly underground, integrated with walls covered in stone along which pedestrian and vehicle routes in the upper part of the facility were built. The size of the start platform was reduced to the minimum to shelter the athletes just before their turn to jump and to house the equipment for the preparation of the runs. The construction of a hill for ski jumping must also be carried out with great precision (in the order of ± cm 2), to ensure that the longitudinal profile of the run corresponds to the theoretical route of the plan. This was why the Olympic hill plan was oriented towards an adjustable solution, both for the in-runs and out-runs. The choice to use a prefabricated frame both for the in-runs (with a steel structure) and for the out-runs (with a reinforced concrete structure), in addition to enabling the adjustment of the runs, also made the complex phase of construction more efficient on the steep slope and under mountain conditions. The judges' tower is characterised by a parallelepiped structure, lower facing the valley, and by a tower with square base above. The areas for the judges and competiton management are located inside a section jutting out from the front side of the building facing the runs of the hills. The characteristic shape of the judges' boxes makes the function of the structure obvious to the public, justifying its presence on the side of the runs. The division of the volumes of the building is underlined by the use of different finishing materials. In its morphological structure the building follows the profile of the rising slope: the lower levels are in fact set in the ground so that the base of the building can adapt to the inclination of the site. The multi-functional building has its longitudinal axis parallel to those of the Olympic hills, bordered by the out-run and is set perpendicuarly to the Chisone stream. The building extends along a central axis starting from about 40 metres from the right bank of the Chisone and finishes against the right hydrographic slope of the valley. According to the plan, the side of the building facing the valley is straight, as it must adapt to the shape of the stands. The side towards the mountain is semi-circular to adapt to the relief of the small existing promontory and to face the scenery of the upper valley.