Salonpas Jet Spray is used for the relief of muscle and joint pain. It contains menthol and methyl salicylate, which work to provide a cooling sensation followed by warmth, helping to alleviate aches and pains. It is commonly used for minor pains related to arthritis, backaches, and sprains. It should be applied to clean, dry skin and can be used up to 3-4 times daily, but not for more than 8 hours at a time. It's important to avoid using it on the face, on wounds or damaged skin, with a heating pad, or if allergic to aspirin or other NSAIDs.