The Forty Below® Bottle Boot™ 1500ml size. It only fits the Cold Weather Bottle in the 1500ml size. It does not fit the Nalgene 1.5qt/48oz. We do make a different model to fit that bottle also; please see the 48oz Bottle Boot model in our lineup.

It is an insulating water bottle cover that helps slow down the water from freezing quickly, especially in extreme cold environments. It is specifically made to fit the German design Cold Weather Bottle 1500ml size only.

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The Forty Below® Bottle Boot™ 1500ml size that only fits the Cold Weather Expedition water bottle in the 1500ml size. This is a fully insulated water bottle cover which helps keep water from freezing, especially in extreme cold environments.

It does not fit the Nalgene brand tall 48oz bottle, if you are interested in that size please go to the 48oz Bottle Boot.

Forty Below® Bottle Boots™ have been used on trips and expeditions worldwide for over 40 years! This insulated bottle cover is a unique design that enables the user to easily use them with mittens or gloves, allowing easy access to the bottle, with no zippers to break or freeze. The closed cell insulation does not absorb water, is 6.5mm thick completely around, on top, and bottom of the bottle for maximum coverage and insulation.

Key Features

  • Fully insulated Bottle Cover.
  • Fits only the 1500ml German design Cold Weather bottles.
  • Easy to use with mittens or gloves.
  • Helps keep liquids from freezing in cold conditions.
  • Helps keep liquids cool in warm conditions.
  • Low Profile Design.
  • Closed Cell 6.5mm thick Neoprene foam insulation.
  • Does not absorb water.
  • No zippers to break or freeze.
  • Webbing belt loop with openings for use with other straps.
  • Velcro front closure with Grab-Tab.
  • Handmade in China.
Get some Forty Below® Bottle Boots™ and see how this outstanding product can help you stay better hydrated and more comfortable in the outdoors!

To find out more about our complete line of insulated bottle covers, as well as more information about helping to keep liquids in extreme places, please see our All About Bottle Covers Section.

See it in Action

Product Specs

  • Insulation: 1/4″ thick stretchy nylon covered closed cell foam (wetsuit type material). Same thickness completely around the bottle.
  • Size: ONLY fits the 1500ml size German design cold weather water bottle. (If you have the “Nalgene 48 oz tall bottle” we have that size also, see link below)
  • Fits bottles up to 4 inches in diameter and 9 inches tall. Stretchy material so it can flex with different shapes of bottles.
  • Colors: Black, Blue, Red, Yellow, Purple.
  • Weight: 5.5 oz (154g)

The Bottle Boot™ name is a declared and used Trademark of Forty Below Ltd and is an original product and name that we invented, designed, manufacture, sell, and has been used around the world by us since 1980. Any use of the name: “Bottle Boot”, “Bottle Boots”, the design of the product, or trade dress is prohibited.

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