Backpacking is listed in standard physiology energy expenditure guide entitled “The Compendium of Physical Activities Tracking Guide” as an average 7 MET activity. That is the highest level of energy that can be expended indefinitely. Most retail shop manuals put garments for this aerobic MET level in their Aerobic Softshell Fabric category (or similar).
A great example used to be the old The North Face shop manual which at one time was found at http://www2.thenorthface.com/sa/technologies/technologies-OU3.html ; excerpts from that shop manual stated in part:
The North Face Apex™ Universal Softshell Fabrics
Usage: Medium levels of aerobic activity (hiking, biking, climbing, skiing, snowboarding) in moderate conditions.
Our most versatile all-around soft shell performance fabric. Apex™ Universal fabric features stretch, high breathability, water resistance and thermal capability. Ideal for moderate aerobic activity in mild climates. Use as a protective outerlayer or insulating midlayer. CFM 5-20
The North Face Apex™ Aerobic Softshell Fabrics
Usage: High levels of extended aerobic activity (running, biking, climbing) in mild conditions.
Our lightest, stretchiest and most breathable Apex™ soft shell fabric. Ideal for high-output aerobic activities in cold, dry climates. Apex™ Aerobic fabric is performance-fitting soft shell fabric that protects you from the elements while providing temperature regulation. CFM 20+.
One of their most common OEM material sources for garments they offered for this market segment was -Polartec WindPro spec’ed 60 CFM. See http://www.polartecheat.net/documents/WindPro.pdf
Solomon CLIMAWIND III Softshell
-Spec’ed at 40 CFM
Patagonia's Nano-Air Jacket and hoody
-Spec’ed at 42 CFM