A ski’s dimensions are made up of three measurements from one edge of the ski to the other at the tip, waist and tail. The tip and tail are measured at the widest spot while the waist is measured at the narrowest spot.
Ski Tip | The ski tip is responsible for the initiation of turns. A wide tip is better for soft snow, while a wider tip and narrower waist combined are better on groomed snow if you want high-tempo, short turns.
Waist Width | The waist width is the number one thing to look at in a ski’s dimensions and can tell you how easy a ski will be able to turn and what terrain it would be best on. Narrow waist widths means that it will be easier to get skis to move edge to edge quicker which is important for going faster on groomed runs, while thicker waist widths allow you to surf on deep powder.
Tail | The tail of the ski helps you exit turns. It usually will have different lengths and shapes for different purposes. You'll notice race skis tails have a flat square profile, this keeps your skis on edge and controlled without loosing its grip.