FIELD: sports equipment or transport for moving over snow cover. SUBSTANCE: ski has sliding surface defined by adjacent longitudinal cylindrical arced portions which are separated by ridge with acute lower edge under supporting platform, with height of ridge gradually decreasing to front end of ski. Cross section of ridge is changed from acute shape to shape approaching trapezium. EFFECT: increased stability of ski against side offset and reduced counteraction to sliding motion. 5 cl, 6 dwg
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