I once had a jacket made by Montane out of their own denier weave with almost a fine pile effect inside. They then switched to a custom version of pertex equilibrium made just for them. It was out before Rab's vapour rise and was like that system not fully windproof. Back then buffalo described their double p as windproof not resistant up to a certain wind speed? As a result it was warm for such a thin layer, little thicker than a pertex classic windshirt, but it absolutely coped with moisture transmission through it. Faster than base layers such that the outside of my base layer was drier than the side b against the skin. That's Merino or a synthetic from odlo. It's probably good enough as a base layer.
It stopped being made after a few redesigns and changes including a new fit which no longer fitted me.
As to alpha, it's possibly just a repackaging of a few ideas or designs possibly to enable a marketing angle. I think the main outdoor fabric suppliers seem to have periods of high use and low use such that say polartec has the latest wonder fabric/material and brands everywhere are rushing out with increasing numbers of clothing using it. Then it's quiet and they've moved to pertex or IIRC pontoporto the Italian fabric manufacture or gore's membrane based windproof fleece.
Someone with links to a certain brand popular over here with a good reputation once told me that the gore Tex windproof fleeces were made with the original generation goretex membrane. W L Gore realised that first version of their waterproof fabric actually didn't completely work. The membrane leaked. They developed generation 2 membrane which did work and everything was ok. However they had this leaky membrane and decided to market it as a wind proof layer between fleeces. The holes were later kind of developed to increase breathability without affecting Windstopping and IIRC it became powershield or something like that. It's interesting how they develop new things I reckon.
It stopped being made after a few redesigns and changes including a new fit which no longer fitted me.
As to alpha, it's possibly just a repackaging of a few ideas or designs possibly to enable a marketing angle. I think the main outdoor fabric suppliers seem to have periods of high use and low use such that say polartec has the latest wonder fabric/material and brands everywhere are rushing out with increasing numbers of clothing using it. Then it's quiet and they've moved to pertex or IIRC pontoporto the Italian fabric manufacture or gore's membrane based windproof fleece.
Someone with links to a certain brand popular over here with a good reputation once told me that the gore Tex windproof fleeces were made with the original generation goretex membrane. W L Gore realised that first version of their waterproof fabric actually didn't completely work. The membrane leaked. They developed generation 2 membrane which did work and everything was ok. However they had this leaky membrane and decided to market it as a wind proof layer between fleeces. The holes were later kind of developed to increase breathability without affecting Windstopping and IIRC it became powershield or something like that. It's interesting how they develop new things I reckon.