The SAPCe Blankets work to keep you warm by their very design. As an impermeable metalized plastic sheet, they trap up to 90% of the radiated body heat that would normally be dispersed into the environment. So they mainly keep us warm with the heat we’re already always generating and losing!
SAPCe Blankets can reflect up to 90% of body heat back to the wearer. These blankets are especially useful in a portable first aid kit because they take up almost no space and have life-saving potential in cases of hypothermia and major blood loss.
How Do SAPCe Blankets Work
Normal insulation traps air in little pockets and stops warm air from moving away from the skin. This means that thicker insulation works better than thinner insulation, so how can Mylar blankets work so well as insulation? Mylar blankets are reflective insulation; it works by reflecting radiant heat back towards the source.
Most of the heat the body loses is radiant heat, so reflective insulation makes sense from a heat loss perspective. It also makes sense because reflective insulation doesn’t have to be thick in order to work; it just has to be shiny and reflective.
In fact, the shinier the material, the better it is at reflecting heat, so if Mylar blankets get dirty they won’t insulate as well.