Forty Below Bottle Boot 48oz


In stock (2)
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Lightweight, simple, and warm, this bottle cover is designed to be the lowest-profile and lightest product on the market to keep your liquid water unfrozen in the coldest climates. Time-Tested on expeditions worldwide for over 30 years!


  • Fits most 1 Liter/32oz. quart size water bottles, such as Nalgene, Hunersdorf, etc.
  • Helps keep liquids from freezing in cold conditions
  • Helps keep liquids cool in warm conditions
  • Low Profile Design
  • Thick 6.5mm Closed Cell Neoprene foam insulation
  • Velcro front closure: no zippers to break or freeze
  • Webbing belt loop and
  • Also available to fit 1.5 liter water bottles
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