White Sierra Bilko II Shell Pant Mens Outer Material: 100% Taslan Nylon--A durable fine-filament nylon fiber that is lightweight. Lining: 100% Nylon Taffeta--Offers you a windproof and breathable lining. Water Resistance: Waterproof--Treated fabrics and specially designed zippers, closures, and seams completely seal out water and rain. Breathable--Allows moisture inside the garment to escape and evaporate. Promotes air flow. Articulated Knee--Non-binding, anatomical fit.