PrimoLoftå¨ is is probably only challenged by goose down for insualtion performance. Used extensively in top outdoor activity clothing Vision have incorportated it into the Subzero jacket which is perfect for wearing under a wading jacket as insulation or as an outer layer with Elasticized cuffs and an adjustable hem seal out wind and trap warmth. Highly wind and water resistent Packs down into a very small space Polyester rip stop shell fabric outer layer PrimoLoftå¨ filling just as warm and faster drying than down Full length center front zipper Two zippered side pockets and a zippered left chest pocket Adjustable and removable hood