• Compression-fitted vest designed with a longer back for the ultimate fit and function
• Shoulders and upper back are made of power mesh for maximum breathability and ultralight, adaptable comfort
• Back pocket with 1.5 liters of gear capacity and right-entry zipper closure is designed to store a jacket, essentials and valuables
• Front sternum and side adjustment straps are designed for a bounce-free run fit
• 4 front pockets; top pocket has bungee loops to hold flask in place and fit up to a 20 fl. oz. flask
• Comes with one 14 fl. oz. tapered flask

-- nathansports.com