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Insulated Bite Top 18oz Soft Flask

4.6 out of 5 stars
10 Reviews
Color:One Color



Insulated Soft Flask with Bite Top

When you're running on warm summer days, it's nice to have a cold, refreshing drink. With the Nathan Insulated Soft Flask with Bite Top, you'll have 18oz of cool refreshment as you run. Its insulated design keeps fluids cooler 38% longer than non-insulated soft flasks so you can expect a refreshing drink even when you're several miles deep. And conveniently, the flask is compatible with all Nathan hydration vests.


  • Insulated soft flask to keep liquids cool while you run
  • 18oz provides you with plenty of on-trail refreshment
  • Bite valve design prevents your liquids from escaping
  • Insulated design keeps the contents cooler for longer
  • Flask is compatible with all Nathan hydration vests
  • Item #NAT004O
Recommended Use
road running, trail running
Manufacturer Warranty