Appreciate the questions here. First thing I'll say is I think I'll be able to address a lot of these questions in detail on a podcast, so look for that in the next 1-2 months.
Second thing, I have a difficult time being brief when talking about product design and how it applies in the field. Because I feel like if it's worth even asking or discussing, that I should give the most in depth and informative answer I can. It's a tough thing to balance, but I do want anyone asking to have the right information for them to make an informed decision on how any given piece of gear might be relatable their preferences or needs in the mountains.
Regarding the Primaloft Evolve mapping and the face fabric used in those areas - because there have been a couple questions about that. The Pursuit Hybrid Fleece is an ACTIVE insulating piece for cold conditions. If the conditions warrant it's use - meaning it's cold enough to need it while one is exerting himself - then breathability is paramount. This is the precedent that this piece is designed on. Through testing several variations of Polartec Alpha and Primaloft Evolve - ranging from completely naked Alpha to completely covered Alpha and/or Evolve - we found that completely naked Alpha has such a narrow use case that it is not useful enough over a broad enough range of conditions that is was something we wanted to move forward with. There were too many condition sets where any existence of wind rendered the piece useless on its own. The transverse was also found to be the case with completely covered Alpha/Evolve. It was simply too warm in too many condition sets, and not breathable enough.
For this piece to truly perform in cold conditions as a piece we can just leave on for hours and days we had to target a balance of maximizing breathability and adequate wind resistance. Wind resistance and breathability work against each other. BUT, the priority for this piece if breathability, since it is an ACTIVE piece. Our target is maximizing breathability while maintaining a level of wind resistance in specific areas to make this piece effective in a useable range of cold conditions. Effective at what? Maintaining enough body heat, while managing body moisture via breathability and drying out.
Any quality or property that would make this piece more wind resistant, warmer, or the face fabric over the Evolve portions more durable, would make this piece less effective at being what it is intended to be. This is just the performance target we aimed for.
Every piece of gear has a balance of tradeoffs, compromises, and benefits. And I understand as a user and consumer that it's easy to start looking for all the things we want something to do for us, while losing sight of what that thing is supposed to do for us in the first place. An analogy I like to convey comes from Formula 1 racing. Specifically the tires on an F1 car. What is their job - priority #1? I'd say it's to maintain traction so the car can put power to the ground to keep the car on the track while moving forward through the track at the fastest speed possible. But it sure would be nice if the tires lasted longer and had longer life right? That would save some money and maybe even mean the driver didn't have to go into pit to change out tires. Those things may be true, but they are lesser or even non-existent priorities because the properties that would enable the tires to last longer or be more durable detract from the tire performing it's #1 job.
To be clear, we're not claiming to have developed the F1 car of apparel, I just like the analogy!