I bought my most recent jar of SnoSeal about 6 years ago and still have some left--it's still good. I no longer wear leather hiking boots, but I have other leather items (street shoes, purse, belts) of leather and find that SnoSeal is one of the best preservatives to keep the leather in shape longer. I've discovered that many Civil War reenactors (who have lots of leather gear) swear by it. The ingredients are all "period correct" for the 1860s.