When you consider what you want in a rain jacket, Stratus checks all the boxes. The fabric was developed by Sun Mountain’s Japanese partner specifically for use in hot, humid climates. It has a 20K/20K waterproof/breathable rating, mechanical stretch for freedom of movement and is lightweight and comfortable. Adding to that, the Stratus jacket has a packable hood, plus front and back venting for added breathability. Two-year waterproof guarantee.