Columbia Back It Up Pant Womens Water Resistance: Waterproof--Treated fabrics and specially designed zippers, closures, and seams completely seal out water and rain. Insulation: 50% polyester, 50% recycled polyester--A lightweight synthetic insulation that helps to trap your warmth in. Seam Sealed--Seams equipped with a barrier against water for a completely waterproof garment. Breathable--Allows moisture inside the garment to escape and evaporate. Promotes air flow. Fabric Content: (Shell) 89% nylon, 11% elastane; 100% nylon; 100% polyester