Primaloft Gold insulation is a great alternative to down and other synthetic insulation blends. Primaloft Gold promotes the ultimate thermal efficiency to keep you warm. With its with permanent water resistance and ventilation, Primaloft Gold is one of the best insulators for sleeping bags, outerwear, gloves, and other insulated accessories. PrimaLoft ultra-fine fibers were developed to be highly water resistant so insulation stays drier and keeps its insulating properties. These same ultra-fine Primaloft fibers create a tight surface tension that prevent water from passing through, even if water is forced into the insulation. If you're looking for packable, lightweight, and warm insulation, Primaloft Gold is a great choice.