Ski that has an upper surface (11), a sliding surface (8) and two lateral flanks (13, 14, 43, 44, 53, 54, 73, 74) comprising a central core (6, 38, 76) , a subset (15) of lower reinforcement located under the core and resting on a sliding soleplate (16) that is surrounded by two lateral edges (9, 10), and a subset (19) of upper reinforcement located on the part top of the core, and covered by a decorative layer (23), each of the reinforcement subsets comprising one or more layers, having at least one of the layers (20, 21, 31, 32, 36, 37, 40, 41 , 48, 49, 50, 68, 87, 88, 90, 96, 98, 99, 100, 101, 102, 103) of upper reinforcement one part (20c, 21c, 31c, 32c, 36c, 37c, 48c, 49c , 50c, 90c, 96c, 98c, 99c, 100c, 101c, 102c, 103c) central covering the upper part of the core and characterized by the fact that at least one section (20a, 21a, 40a, 40b, 41a, 48a , 49a, 50a, 68a, 87a, 88a, 90a, 90b, 96a, 96b, 98a, 9 8b, 100a, 100b, 101a, 101b, 102a, 102b, 103a, 103b) lateral of this upper reinforcement layer, descends again in the direction of a ridge and characterized by the fact that at least one of the layers (20, 21, 31, 32, 36, 37, 40, 41, 48, 49, 50, 68, 86, 87, 90, 96, 98, 99, 100, 101, 102, 103) reinforcement of the upper reinforcement subset has an asymmetric structure at the level of its lateral sections along at least a part of its length,
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