FTYB Hydration & Water Treatment Forty Below Deluxe Bottle Boot

The Forty Below® Bottle Boot is a high performance insulated bottle cover and holder that helps keeps water from freezing, especially in extreme cold environments.
Available in three sizes, it fits perfectly on the Nalgene 32oz, 48oz, and 64oz bottles and the 40 Below Cold Weather 1.0 Liter Water Bottle. Our 6 sizes of bottle covers have been used on the world’s coldest and highest places, since the 1970’s!

NOTE: Comes in assorted colors. If you have a color preference, please make a note at checkout.