Warm, Breathable, Temperature Regulating Insulation The Thermoneutral Collection is the insulation layer wearers of down have been waiting for. Warm when you need it, water resistant inside and out. Our testers love it because you rarely need to take it off, it regulates your body temperature in a wide range of cooler temperatures. Keeping the kiddos warm and dry. These pants offer superb midlayer warmth and quick drying properties, thanks to the DWR treated 650 fill duck down. Each individual down feather is treated with Activ Dri Down which keeps the down drier and reduces water or sweat absorption by over 60 percent; so it retains its loft and warmth to weight ratio, even if you get caught in a squall. The quick drying properties are ideal for overnight trips where you need quick drying capabilities.