Adhesive Heat Pad / Warm Pad / Heat Pack / Warm Pack / heatpad / Warm Pad / Hand warmer / Leg Warmer/ Feet warmer//Menstrual Period Cramp Relief/ Comes with 3 variations : - A) Body warmer 1. Product should affixed to the outside of underwear, do not directly attached to the skin 2. Please be careful low-temperature burns.long-time body heat will produce erythema, blisters and other symptoms.The maximum heating temperature is 66, do not use it while sleeping at night 3. Children, the disabled or sensitive skin should use more attention in the low-temperature burns happen 4. Up to 12 hours of soothing heat. 5. Body heat pads last up to 12 hours. Great for all-day pain relief from cramps or soothing sore muscles. 6. Thin and flexible, These Heat Pads can be worn comfortably without bulkiness. Unlike a hot water bottle or microwave bag, you can stay toasty warm. B) Feet warmer (1 pack = 2 pads) 1. Product should affixed to the outside of socks or inside the shoes , do not directly attach to the skin 2. Please be careful low-temperature burns.long-time body heat will produce erythema, blisters and other symptoms. Do not use it while sleeping at night 3. Children, the disabled or sensitive skin should use more attention in the low-temperature burns happen 4. Up to 8 hours of soothing heat, great to keep your feet warm for hours. 5. Thin and flexible, these Heat Pads can be worn comfortably without bulkiness. Unlike a hot water bottle or microwave bag, you can stay toasty warm. B) Hand warmer ***The duck design is the inner layer, do not open the inner layer, just remove the outer packaging and start using*** 1. Comes with non-adhesive layer, taken out from the packaging and the pad will self-heating. 2. Please stop using it if you are feeling uncomfortable. Do not use it while sleeping at night 3. Children, the disabled or sensitive skin should use more attention in the low-temperature burns happen 4. Up to 8 hours of soothing heat, great to keep your hand warm for hours. 5. Thin and flexible, these Heat Pads can be held comfortably without bulkiness. Unlike a hot water bottle or microwave bag, you can stay toasty warm.