Lasts up to 8 hours. 5% Natural menthol. Powerful muscle & joint pain relief. For aches, sprains, and strains. Thin, comfortable, & easy to apply. Well Patch Pain Relieving Pad is a soft, flexible pain relieving pad that provides fast, long-lasting, soothing pain relief where it hurts. Well Patch Pain Relieving Pad is thin enough to wear unnoticed under clothes day or night. It adheres firmly on muscles or joints yet removes easily. It is not messy or greasy and will not stain your clothing. Only you will know that you are wearing Well Patch. A pain relieving gel layer adheres and removes easily. Protective film remove during application. Store unused pad in the pouch. Reseal pouch after opening. Made in Japan.