Designed first and foremost to keep you dry, the Watertight II Jacket from Columia is made from 100% nylon full dull plain weave fabric with Omni-Tech. Omni-Tech waterproof-breathable fabric has a microporous membrane that allows sweat vapor to escape, while keeping water droplets out, so you stay dry and comfortable. Fully-sealed seams and an attached adjustable storm hood help block out the elements.