Altrec Outdoors says:
Keep your leather boots soft, supple and able to repel water in soggy conditions when you regularly apply Filson Boot Oil Finish. This is the same stuff Filson uses to tan their boots. To use, clean off your boots, dry them away from any heat source, apply a generous amount of Filson's original Boot Oil Finish to all seams and stitching and a lighter coat to the rest of the boot. Once they dry overnight you can wipe off any excess and be ready to wear them outside in nasty weather.
Historic Range: $8.25