... in open country,outdoor sport,go out for travel.it is a good to which people with physically ... oil one time.Safety,no toxic, environmental protection.How to use:1.open the cover of warmer. 2. ... ,improve sleep,etc.Keep warm:suits for that go to school,travel,outdoor work,work on night,work ... in sea,guard,stand guard, mountaineering,go fishing,skee,etc.when weather being cold.Medical treatment ...