Trauma patients may experience acidosis, coagulopathy, and hypothermia as a result of decreased circulating blood volume. This lethal triad [1] has been recognized as an important cause of death in trauma patients. In fact, numerous reports have described a relation between hypothermia and mortality in trauma patients [2][3][4][5][6]. Heat loss typically occurs at a rate of 60-75 kcal/h, but can occur at a rate of 400 kcal/h in trauma patients [7]. Even mild hypothermia can result in significant increase in morbidity [2,3]. Gentilello et al. [8] confirmed that reducing the duration of hypothermia decreased the overall fluid requirement and increased the likelihood of resuscitation. Consequently, early prevention of hypothermia is extremely important in trauma patients.In Japan, trauma patients account for approximately