Abstract: A ski structure having a trapezoidal, foamed core wrapped with fiber-reinforced plastic with its wider base facing downward. The plastic sections covering the base and top of the trapezoidal core are rigidly joined to juxtaposed layers of fiber-reinforced plastic, which, in turn are combined with other layers of suitable material into a generally boxlike structure shaped like a ski. The spaces within the boxlike structure on each side of the trapezoid are also filled with foamed material.