Isotex: Waterproof, breathable and windproof membrane technology. Made from recycled plastic bottles. From The Giovanna Fletcher Collection. The women's rain mac is finished with stylish snap fasteners. 100% Polyester. Stylish and waterproof, our Bayla women's raincoat is a wardrobe staple for this season. Featuring waterproof Isotex 5000 fabric, you'll stay protected from rainfall. The women's rain mac is finished with trendy snap fasteners.