HANDS FREEErgonomically-designed hand-strap provides grip-free comfort, and maximizes running efficiency. Breathable wicking mesh under hand position provides superior grip while the ExoSpine™ creates superior hand feel and support for the soft flask.MULTIPURPOSE14oz. BPA-Free soft flask with bite valve can be easily removed from sleeve and used in NATHAN hydration vest pockets. 14 oz /414 mL BPA-FREE soft flask with bite valve The rigid ExoSpine™ creates superior hand feel and support Ergonomically-designed hand strap for grip-free comfort Breathable wicking mesh underhand position provides grip Small stash pockets for gels, keys, credit cards, and more Soft flask can be easily removed from sleeve 60% Nylon, 10% Spandex, 30% Polyester Storage Capacity: 8.5 cu in/0.14 Liters Weight With Soft Flasks: 2 oz/59 g