Body Warmers individually sealed in an airtight packages; 　 　 　 Each packet measures four by five inches and provides up to 12 hours of warmth; 　 　 　 Air-activated portable packets, no wires or batteries required; 　 　 　 　 Odorless, disposable, non-toxic, and nonflammable; 　 　 　 　 Contains all natural ingredients; 　 　 　 　 Size: 5.3 x 4 (inch), average temperature: 127 ℉; max temperature: 145 ℉ 　 　 Usage: 　 For the field work, mountain camping, polar expeditions, winter tourism, skiing, fishing and other outdoor sports to provides soothing comfort for minor aches and pains, as well as extended everyday warmth during outdoor sporting activities; 　 　 　 　 For the cold chills, female menstrual care,medicinal effects swelling pain, middle-aged people such as rheumatoid joint pain, provide cold warm care; 　 　 How: 　 (1) Remove the inner bag from package; 　 　 　 　 (2) Remove the paper, then affixed to the outside of underwear, make it smooth with hand; 　 　 　 　 (3) After use, gently remove it from the clothes; 　 　 　 　 (4) Can be attached to the body of the shoulder, back, waist, stomach and knees, etc.; 　 　 　 　 (5) One piece use for one time. 　 　 Note: 　 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 ℃, 12-20 hours a sustainable uniform heat, do not use it while sleeping at night. 　 　 　 　 3.Pregnant women and diabetic patients and blocked the blood circulation is required to use under the guidance of a doctor. 　 　 　 　 4.Children, the disabled or sensitive skin should use more attention in the low-temperature burns happen.