Heavy rain protection in an ultralight package - the Watertight II Jack from Columbia® is a packable jacket featuring an Omni-Tech™ waterproofing that shields from wet weather, while allowing excess heat to escape during dynamic activity. The Omni-Tech™ shell features a two-layer design with plainweave outer and waterproof membrane, waterproof and fully seam-sealed protection, and a breathable design that allows passage of moisture-vapor from perspiration, keeping you dry in the elements.