1,heat method:instant 2,CE,ISO and SGS has passed 3,duration: ... 4,environmental protection 5,warm uterus paste Use area:Designed for fishmen,golfers, skiers or people who work or play in ... the cold for long hoursProduct features : 1. It can keep your warm fast ... after you use it. 2. It be heating for about 8 hours . 3. the average is 43°C, the ...