This slosh reducing, efficient flask feels great in hand and now features insulated hydration to keep you cooler, longer.

• 18oz / 535 mL BPA-FREE Insulated Soft Flask with bite valve
• Insulated properties keep fluids cooler 38% longer than non-insulated soft flasks
• Ergo-designed hand strap provides grip-free comfort, and maximizes running efficiency
• Soft flask can be easily removed from sleeve, and used in NATHAN hydration vest pocket