The opinion of Aventure Nordique
The Forty Below Bottle Boot 48oz / 1.4L is an insulated sleeve designed to slow down water freezing in cold environments. It fits most 1-liter water bottles, including the Nalgene 48oz / 1.4L and the Hydro Flask and Kleen Kanteen 1.2L bottles.
Made from 6.5 mm thick closed-cell neoprene foam, this sleeve provides even insulation around the bottle. It limits the cooling of the liquid in winter conditions and can also help keep a drink cold in warm weather.
The front Velcro closure with a pull tab is easy to use even with gloves or mittens. The absence of a zipper prevents the risk of the sleeve freezing shut. A webbing loop allows you to attach the sleeve to a belt, backpack, or carrying strap.
Points to remember
Used for decades, these insulating covers have proven their worth in the coldest conditions: high-altitude expeditions, Arctic conditions. They slow the cooling and freezing of liquids in cold weather but also keep liquids cool in warm weather.
Technical details
| Brand | Forty Bellow |
|---|---|
| Product name | Forty Below Bottle Boot 48oz |
| Weight | 182 g |
| Material | Insulation: 1/4″ (6.5mm) thick stretchy nylon covered closed cell foam (wetsuit type material). Uniform thickness. |
| Additional information |
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