Within each of the above letter classifications, hikes may also be described subjectively as Easy, Moderate, and Difficult in comparison to other trips of the same classification. Thus, a Difficult B hike is harder than an Easy B hike, but easier than a Moderate C hike.
Advanced ski tours are generally over 10 miles on difficult terrain and at a fast pace. To go on an Advanced ski trip, you must be able to break trail for three miles and must have excellent Nordic downhill ability. In addition to the CMC essentials, you should carry a shovel, avalanche beacon, and any extra items required by the leader.