The sidecut's a general term for the inner curvature of a ski, snowboard, or skiboard. The sidecut depth's measured as the distance between the waist of the board and an imaginary straight line that strikes both of the contact points at the tip and tail. The sidecut radius's the radial measurement of the curve that matches the inner curvature of the ski, snowboard, or skiboard. For instance, with a radial sidecut, a circle with a particular radius will perfectly fit the curvature of the sidecut.… (More on Sidecut)