... 3,duration:12 hours 4,environmental 5,Self-heating warmer patch Self-heating warmer patchUse area:Designed for fishmen,golfers, skiers ... your warm fast after you use it. 2. It be heating for about 8 hours . 3. the average is 43° ... 95mmnet weight40 gpacking300 pcs/cartonheating duration12 hoursThe Shape, size, and heating time, highest temperature and average temperature can producted all according ...