Tallow is Nature's Original Leather Conditioner.
When you think about it, leather comes from cows (most often) and what is natural to keep a cow's skin soft and supple? You guessed it, FAT! When leather is tanned, the natural fats are stripped out, and then later fats are added back in to the leather in a process called "fatliquoring." Tallow (rendered beef fat that is processed and relatively shelf stable) is one of the fats often used in fatliquoring to re-hydrate and soften the newly tanned leather. Tallow also happens to be very compatible to human skin on a molecular level, which makes it great for moisturizing YOUR skin, too.