Easy and Convenient - No charging, self heating, easy and convenient. One-time use,simply open packaging and the Heated Patch will gradually heat up on its own, fast heating and long-lasting, a good partner in winter Safe to use - Made of active carbon, safe and non-toxic.It can offer you long lasting warmth, can provide heat continuously to the body. Note: paste the warmer sticker on the clothing, not allowing paste directly on the skin Suitable - The body warmer patches are suitable for cold chills, female menstrual care and pain relief, etc. Portable size and slim shape,easy to carry Ergonomic Design - ultra-thin, comfortable, ergonomic design helps to fit to contours of the back; flexible enough to be worn on the move, during chores or when relaxing Wide Use - skiing, walking, winter sports, winter tourism, field work, mountain camping, polar expeditions, skiing, fishing and other outdoor sports to provide warmth protection