Base structure is the process of adding tiny grooves on the base of your skis to optimize the amount of glide for any given snow condition. In a nut shell, if the snow is cold and dry, you want to have a fine,condensed,rigid structure to help add moisture between the base of your ski and the snow to help the ski glide more efficiently. If the snow is warm and wet, you want to add a more coarse, round structure to help remove excess water between the base of the ski and the snow which will minimize friction/suction and improve gliding characteristics. We offer many different base structures that can be tuned for varying snow conditions and added to ski. All of our skis come with base structure as well as a world-cup race tune.