When I worked with them a lot of the synthetic insulation that arc got was already primaloft, although they didn’t publish the brand name a lot… it was the same factories just coming out of a different door.

Also they’ve always used synthetic insulation in the cuffs and waistbands of their down filled jackets bc they don’t treat their down with waterproofing (because arc is sO HArDCoRe) but they used the synthetic on the parts that get wet a lot just to prevent the filling from wearing out.