Thermaflex helps reduce swelling to speed recovery and relieve pain. The special formula contains MSM, a natural anti-inflammatory that stimulates circulation. Apply to horse's tired, sore muscles and joints after a workout, when pores are open, for best results. Rub into muscles, massage it into strained and painful areas, and work it into stiff, sore joints - starts to work immediately. No need to wrap. Natural extracts increase circulation whenever it is applied for long lasting heat sensation. Acetone free.