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The Vapor Airess 7L 2. 0 Hydration Vest is Nathan’s first race vest to feature its innovative Adaptive-Fit Adjustable Sizing System. This system creates a fit and feel that feels almost tailored. It has two adjustment points that allow you to alter the waist and bust fit separately to create a body-mapped fit for your specific body type. Once adjusted the vest stays snugly in place as your race through the miles while the breathable chafe-free construction ensures comfort. For during-your-run-convenience Nathan included a 2-liter bladder with a quick release valve for easy drinking. The Vapor Airess also features a plethora of pockets organize your gels layers soft flasks and bottles up to 22oz and other essential gear. Additionally elastic drawcord loops on the back of the pack accommodate your trekking poles when you don’t need them. Finally with reflective hits all around the vest you’ll be able to confidently run in low-light conditions during long races or training runs that last past sun down.