KOOL-OUT CLAY non-medicated poultice cools and tightens horses legs and feet after workouts and races. It can be used on thin-skinned horses, will not react with other medications, and can even be used over nicks and cuts. KOOL-OUT CLAY will not cause scurf or blistering and will not react with leg paints or other medications. This creamy and smooth formula goes on and comes off easily without leaving the skin sore.