Several manufacturers now use progressive sidecut.
Traditionally, the sidecut shape of a ski describes a perfect arc, or part of a circle. But as skis have gotten wider in the past few years, that caused problems, especially in longer all mountain skis.
The solution is to make the sidecut less towards the tail thereby making the ski narrower and also friendlier to ski on because the tail will release more easily—a bonus in crud or powder.
The result is a sidecut where the arc of the edge varies at every point along the ski. A progressive sidecut is usually described as two numbers such as 14/16 meaning the sidecut ranges from 14m in the tip to 16m in the tail.
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