This product was formerly known as: Performance Activity Glove. Waterproof, Unisex. Primaloft was originally developed under contract for the United States Army as a replacement for regular down because down absorbs water and loses its insulating properties when wet. The lightweight and soft Primaloft® insulation core creates millions of air spaces suspended in the mibrofibre mesh. Even when forced into the Primaloft® core, water is repelled and not absorbed by the patented microfibre structure, so Primaloft® keeps you warm, even in the wet.