The North Face Men's Stretch Thermoball Jacket is a packable jacket for midweight warmth on the trails. Move any way you wish and this jacket will follow with ease due to the nylon/elastane stretch taffeta fabric it has been built from. The ThermoBall™ insulation powered by PrimaLoft® adds heat and won't give up, even if it gets wet. Don't worry, a durable water repellent finish coats the exterior, helping to prevent light moisture from soaking in. You never know what may happen, so stow it in its own hand pocket and always have it handy in your pack.