Trakker Downpour Jacket The re-engineered full-length zipped Downpour Jacket offers a lightweight, waterproof yet breathable fabric that is ideal for use during wet conditions. A superb garment to wear on top of a T-shirt during the summer months, or can be combined with thermal underclothes during the cooler months. Combine with the Downpour Trousers for a fully waterproof clothing solution.