EUC Like new! Dryvent by The North Face Seam-sealed protection. Maximum coverage. Engineered to be fully waterproof, windproof and breathable. About the technology. DryVent™ fabrics deliver reliable protection from the elements when you need it most. Constructed with a semipermeable polyurethane coating, the multi-layered fabric blocks water from getting in while allowing vapor to escape, reducing interior moisture build up. The outer face of DryVent™ fabric is also treated with a durable water-repellent finish that helps form droplets and repel water from the surface.