Sidecut

Cutout and radius.Even the, at first glance, the straightest ski is not completely straight. The edge of each ski from a plan view copies a part of a circle (or an oval or a similar curve - more under the word sidecut). The more the ski is cut out, the smaller the radius of this copied circle. On the contrary, the "straighter" the ski is, the larger the cutting radius (radius). The cut-out radius is one of the variables that has a major influence on the turning of the skis, thus on their controllability and behavior at different speeds. The construction radius, i.e. the theoretical calculated value of the radius of the imaginary circle that would be created according to the cut of the ski, is usually given as one data (sometimes 2, exceptionally 3, more complex radius), but the shape of the cut, with exceptions, is not regular (the largest cut in the tip, smallest in the middle, smaller in the heel). When riding in an arc, the cornered ski bends (deflection) and accordingly creates the radius of the actually driven arc - always smaller than the design one. The radius changes with the length of the ski while maintaining the width parameters - the shorter the radius, the smaller the radius and vice versa.

Source: https://snow.cz/clanek/3655-slovnicek-freeridove-lyze