If you’re looking for an ultralight compactable 100% waterproof breathable shell jacket then the Thunderlight is for you. This shell has a patented T-Core coating that’s 100% waterproof while still allowing vapor to escape from within. The seams are all 100% taped to ensure a watertight seal all around. If the weather looks questionable you can fold the Thunderlight into its own pocket and toss it in your pack just in case and since it weighs less than a pound you won't notice it’s there until you need it. The Rip-Stop taffeta and durable water repellent finish adds a shield of durability defense so it can handle the harshest outdoor conditions.