HyVent technology uses polyurethane to create waterproof yet breathable products. DryVent contains a multi-layered textile material that’s coated in a water-repellant finish. DryVent products are usually light and flexible in nature, which adds to their breathability. It's been lab tested by The North Face to ensure that it will deliver waterproof functionality, breathability, and long-lasting durability. The North Face Hyvent works by providing a completely waterproof shell that protects in rain and snow conditions. The North Face Hyvent is also designed to be highly breathable, so it won't smother you with heat despite its barrier-like properties. Best of all, The North Face Hyvent is built to last with a highly durable construction.