Stay hydrated on the go with the Nathan Pinnacle Insulated Soft Flask Handheld 18oz. This soft flask features Nathan's advanced ExoSpine™ technology, providing a stable, rigid feel in your hand for easy carrying, while the insulated design keeps your drinks cool for longer. A lightweight sleeve with an ergonomic, breathable mesh strap offers a secure, no-grip fit to reduce hand fatigue, and a convenient storage pocket with an elastic opening easily holds small essentials like keys, energy gels, or nutrition.