Heat seems to be more effective when it does not have to travel through as much space to reach the body. For example, the gap between your body and the radiant heating elements in a sauna may be from 6 inches to a couple of feet with the space lowering the effective amount of energy reaching your skin. During a wrap, the design permits gaps of 1 millimeter to perhaps 6 inches; less loss due to distance means more energy and more sweat. The session length is also longer, allowing the body more time to work up a sweat and release fats and toxins. This is possible because the participant is breathing room temperature air.