This is the Original Sno-Seal Beeswax Waterproofing. It will protect leather from rain, sun, snow, and salt. The beeswax formula dries to a solid wax that "stays put" in the surface of the leather so it lasts longer.
Other competitors' greases, oil, and animal products are able to work their way through the leather till they clog all the pores. These waterproofing products fill the natural spaces that are supposed to absorb perspiration and insulate.
Also, animal fats weaken and rot leather over time. Think about it, the tannery worked hard to remove all the animal the fats and preserve the leather. Why would you want to put it back on?
Sno-Seal will help you feel more comfortable in Gore-Tex® fabric lined boots because it allows the Gore-Tex®-absorbed perspiration to escape out of the leather.