18oz Insulated Soft Flask

The Nathan 18oz Insulated Soft Flask offers a lightweight, flexible hydration solution designed for endurance athletes. Its insulated design keeps fluids cool during long workouts, while the soft, collapsible body minimizes bounce and bulk. Easy to carry and refill, this flask ensures convenient access to hydration without interrupting your pace. Ideal for runners and triathletes seeking reliable, temperature-controlled hydration on the go.