The rewarming benefit of anterior torso heat pad application in mildly hypothermic conscious adult trauma patients remains inconclusive in this randomized comparative clinical trial. There was no between-group rewarming gain in ear canal temperature when an anterior torso chemical heat pad was compared with blankets. Patient awareness, and favorable perception of, being administered the active intervention (heat pad) could explain the significant improvement in patient-rated cold discomfort discerned with the heat pad. In the context of marginal demonstrated benefit, it would have been informative to ascertain adverse effects related to the heat pad, including burn injury to the chest wall.