Nathan Insulated Soft Flask with ExoSpine (532 ml)

The Nathan Insulated Soft Flask with ExoSpine (532 ml) is designed for runners and hikers who want to keep their drinks cool longer in hot conditions. Thanks to its insulating construction, your fluids stay cool up to 38% longer than with a standard soft flask.

The integrated ExoSpine structure provides extra stability and makes inserting and removing the flask from your hydration vest easy. The flask maintains its shape where needed, while its flexible design allows it to shrink as you drink, reducing sloshing and making it more compact.

The bite valve delivers a controlled flow of water for fast and efficient hydration on the go. The soft flask is fully compatible with all Nathan hydration vests, making it an ideal upgrade or replacement for your current system.

The key features of the Nathan Insulated Soft Flask with ExoSpine (532 ml) at a glance:

• Content: 532 ml
• Keeps liquids cool for up to 38% longer
• ExoSpine structure for extra stability
• Bite valve for controlled water flow
• Flexible design that shrinks while drinking
• Compatible with all Nathan hydration vests
• Ideal for running and walking in warm weather