Danner Leather Waterproofing Treatment is a unique waterproofing treatment that's breathable, meaning it blocks water from the outside while letting moisture escape from the inside of your boots. Danner Leather Waterproofing Treatment is easy to apply, offers long-lasting resistance to water and snow and makes boots easier to clean. Prevents excess water from creating water spots between the leather and membrane and helps eliminate the constant soaking and drying of leather that may ruin the snug fit of your boots. 4-oz. gel is for full-grain leathers only. USA made.