Pertex Shield® 2.5L Waterproof/ Breathable, 100% Nylon, 89 g/m2 with 80/20 DWRPertex Shield® is a 2.5 layer fusion of a technically advanced Nylon Ripstop with a DWR and a proprietary waterproof/breathable microporous coating. Pertex Shield® provides the perfect balance of waterproofness, breathability, and wind resistance in a lightweight, seasonally versatile package.