Natural Ingredient Formula-- Our knee patches is extracted from a variety of natural plants. When you open the package, you will smell a natural herbal scent, which is the essence extracted from various precious herbs. Knee Relief patch-- This Knee relief patch is scientifically backed to provide fast, continuous and deep penetration relief. Self-heating patch design, natural ingredients, more assured to use. Easy to Use-- Just wash the affected skin with warm water, remove the protective film, and stick the knee relief patch on your affected area. Note: This knee kain patch is for external use only. Applicable People-- This patch is suitable for middle-aged and elderly people, manual workers, fitness enthusiasts and other people. Due to physical differences, some people may experience burning sensation or redness after use, which is a normal phenomenon. Simple but Effective -- Our Heat Patches is a simple but effective solution thanks to its content of natural ingredients that can help tension in your muscle or joints after strenuous exercise or intense activities.