FATMAP difficulty grade
The 100's are a route through what are often referred to as the Hourglass Cliffs.
The Hourglass Cliffs are a rock outcropping that is exposed to high winds.
The snowpack is often very thin.
The thin snowpack coupled with the many rock features means that there are often small avalanches in Hourglass Cliffs. The 100's is the furthest skiers right in Hourglass cliffs, and usually has the most consistent snow.