Featuring the same great hand-feel, this slosh reducing, super-efficient handheld now features insulated hydration to keep runners 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

The rigid ExoSpine™ for superior hand feel and support for the soft flask

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 pockets

Breathable wicking mesh under hand position provides superior grip

Expandable stash pocket for small items or nutrition

Specs

Storage Capacity: 8.5 cu in/0.14 Liters

Weight With Bottle: 3.2 oz/91 g