Hi vince,
The better options and possibilities I’m aware of in the Philadelphia area are listed in post #4 here.
Some discussion and feedback with another forum member in the Philadelphia area in this thread may also be helpful.
I personally wouldn’t focus too much on a theoretical design or trying to figure out which layering may be “best” based on theory or specs when you are testing locally and let your body tell you which design works best for you. The end result (in terms of PPP or Pressure relief, Posture and alignment, and Personal preferences) is always more important than the means of getting there
Phoenix