The Ultra-Pak™ Jacket is exactly that! The ultimate light weight waterproof & breathable shell, weighing only 8 oz. The “U.P.” is designed for ultimate self packability. Perfect for the golf bag, backpack, or boat locker. Made with a light weight breathable fabric, the Ultra-Pak™ is High Tech Comfort and Performance at a terrific value. It’s like nothing you’ve ever worn before.