I first heard about Saphir products on an article on the Wirecutter. They tested a variety of products on dress shoes and Saphir was at the top in terms of cleaning and conditioning. And after the first use on my vintage Florsheim boots (from the 70's so they were pretty old), I could not stop using it on all my other shoes. This, combined with 2 good saddle soap cleaning sessions (clean the item depending on the time lapsed since the previous cleaning) and whatever Saphir shoe cream/wax you use will make your shoes gleam, on top of that the leather is nourished and had a completely different feel to it after the treatment. The leather had more strength and body to it with added flexibility. But I believe this product doesn't just work on shoes, I also have a sheepskin ("natural", unfinished leather) coat from the 70's and the leather on the coat experienced the same qualities post-treatment just like my boots! Although I made an inquiry here on Amazon and 2 users advised against using it on my coat, I tried it anyway. And after applying an even amount on both sleeves and letting the product soak into the leather completely, I am impressed. The leather had a different weight to it, it was not as flimsy as before, yet it had more flexibility. It also enhanced the natural characteristics of the leather, bringing out the varied shades of brown even more which I love. It did darken the leather a smidge (no sarcasm it literally got only a bit darker) overall, but I really do not mind. Fantastic product. HIGHLY RECOMMEND.