This is hands down the best product to restore/keep your cherished leather goods. As a lifelong biker I have boots, chaps, jackets, vests, etc. that have been to the gates of hell and back in rain, dust, snow, you get it?
An old biker showed me a great little trick I have used for 40 years. Follow the instructions for applying Wonder Balsam and when you have finished, use a blow dryer just to heat up the leather enough for the pores to expand a little bit and absorb the product. Now instead of Wonder Balsam laying on the surface, it is inside the leather leaving your boots literally inside out protected.