V-neck w/zipper closure, and hook and loop girth adjustments; built-in pocket for hydration bladder and drinking hose w/valve (included). Phase Change Cooling Inserts maintain a comfortable 58°F (15°C) for up to 3 hours. 100% cotton (excluding inserts). Inserts help to keep drinking water cool. Volume: 70 fl. oz. (2 liters). Include one (1) set of Phase Change Cooling Inserts (6665) and Hydration System (6660). 7 lbs., unfilled.
