ColdPruf Women's Tops are perfect worn on its own or as a base, mid, or outer layer. The Platinum two layer garment has been specifically engineered with our ColdPruf technology to trap air between the layers of fabric to provide a natural warmth shield. The Platinum offers the desired level of warmth and comfort in very cold to extremely cold weather during mid to high activity. Nature's natural warmth fiber, merino wool, blended with polyester on the outside and combined with CPT Performance Polyester on the inside, provides maximum warmth, dryness, and comfort and at the same time provides odor control on the fabric. The ColdPruf Base Layer product line has been developed for comfort in all cold weather environments, whether at home, on the job or enjoying the outdoors.