@ Nicholas P thank you for that test. It certainly proves that for moist weather use, it’s probably not a good idea to be having The wool version. Which for me in UK means never!
@Alf B
This is not correct
Core is a range of similar fabrics made by primaloft, but not the same at all as Alpha which is made by polartec. Different fabrics by different companies.
Alpha in the UK has always been known as Polartech Alpha and has been used by a companies like RAB for well over 10 years. And Alpha Direct has been used for at least 7 years here though I don’t think they have any current models using it.
Berghaus do have a jacket Alpha at the moment
I know you are a member of trek-lite.com. there is a regular member there who has extensively used garments made of both types of fabric. And they have found them to be notably different in characteristics with real world use. Mostly to do with moisture handling capabilities. I have no experience with core myself but I do with Alpha and I really rate it.
I suspect omm have gone for Primaloft Core over polartec Alpha Direct partly because it is more readily available to them. Supplies of alpha seem erratic to say the least.
Thread ‘Polartec Alpha KoolAid Thread’ https://www.trek-lite.com/index.php?threads/polartec-alpha-koolaid-thread.5912/