This weatherproof H2No® Barrier from Patagonia is a gas permeable, waterproof structure that excels when the elements are at their worst. This fabric comes in 2, 2.5, and 3-layer constructions to accommodate differing conditions and activities. The various layers are created by laminating performance fabrics with a waterproof and breathable material. Patagonia ensures all its products utilizing H2No® technology meet strict performance and quality standards and hold their waterproofing for the life of the garment.