The Black Diamond Treeline Shell features a 2.5 layer 10K/10K Fabric that is fully seam sealed, waterproof and breathable. The Treeline Shell is 100% waterproof and windproof. The Treeline Shell comes with YKK® Aquagaurd center front zipper that keeps moisture out, and DWR for ventilation. A back vent with mesh pockets adds to the breathability by increasing airflow. Also has two backpack friendly zip hand pockets to keep your map and compass handy. Climbing helmet compatible hood.