Keep yourself hydrated while pushing your limits on the running track with the Nathan Pinnacle 18 oz Insulated Soft Flask. Perfect for endurance athletes, this handheld is designed with a proprietary ExoSpine to provide a superior hand feel and support. The flask is BPA-free and insulated to maintain the coolness of your fluids for a longer duration. The ergonomic hand strap ensures grip-free comfort, while the breathable wicking mesh adds to your overall comfort. It even includes small expandable pockets to store gels, keys and other essentials. And the best part? The soft flask can be easily removed from the sleeve for hassle-free cleaning.