Columbia’s own, three layer, waterproof and breathable shell material. The top layer is made up of stain and water resistant Omni-Shield® material that helps keep dirt and grime off of the garment. The second layer serves as the main waterproofing membrane, while the third layer evaporates moisture and transfers heat outwards through the other layers. Having the waterproofing at the second layer allows stains and grime to be easily lifted and washed from the surface of the jacket or pant.