All About Bottle Covers

Used on expeditions and adventures around the world, our insulated bottle covers—known by our trademark name Bottle Boots™—are essential gear for cold-weather climbers and hikers. They’ve been helping people keep their water from freezing in some of the coldest and highest places on Earth since the 1980s.

Check out our Bottle Covers

Key Features of Forty Below® Bottle Boots™

  • Used on expeditions and trips for over 40 years!
  • Several sizes to fit all sizes of popular outdoor bottles
  • Prevents liquids from freezing in cold conditions
  • Also keeps liquids cool in warm conditions!
  • Velcro front closure with Grab-Tab - Easy to use with mittens or gloves
  • No zippers to break or freeze
  • Low Profile Design, packs small
  • Does not absorb water
  • Webbing belt loop

Each Bottle Boot™ is handmade in a variety of sizes and shapes, designed for ease of use and maximum effectiveness. They help significantly slow down the freezing of liquids in water bottles or metal vacuum bottles in extreme cold, and also help keep liquids cool in hot environments.

The Bottle Boots™ feature a capsule-style design that fully encloses the bottle in 6.5 mm closed-cell neoprene insulation. The shape and materials make them easy to handle—even while wearing mittens or gloves. A front hook-and-loop tab includes a longer fold-over section for better grip, allowing for quick and efficient opening and closing. On the back, a 2-inch-wide webbing panel with a 3-inch gap accommodates backpack hip belts, side straps, or sternum straps for easy carry and access.

Available in a variety of colors, Bottle Boots™ help users identify different beverages and keep track of gear in group or expedition settings.

Forty Below® Bottle Boots™ insulate in both cold and hot conditions, slowing the freezing of liquids in winter and keeping drinks cooler in hot weather.

Bottle Boot Sizes

- 1.0 Liter / 32 oz

  • a perfect fit for the 40 Below Cold Weather Water Bottle in the 1.0 Liter size
  • fits most 1 quart and 1 liter size water bottles (Nalgene 32oz, Gatorade, Powerade, and other typical hiking style water bottles)

- 0.5 Liter / 16 oz

- 0.75 Liter / 24 oz

  • fits the 24 ounce and 750ml Camelback, Nalgene, and other popular sport water bottles
  • fits most stainless 16 oz. vacuum bottles.

- 1.5 Liter

- 48 oz

  • fits the Nalgene brand tall 48 oz. bottles
  • fits many 1 qt/liter stainless vacuum bottles

- 1.4/2 Quart

  • Fits most 2 quart Thermos brand and other vacuum bottles.

Check out part of this video (starting at 6:30) from Sintax77 explaining our bottle cover/water bottles: LINK