Oh, and that’s only if you use the Mylar blanket to cover your HEAD since this is where most radiant heat is lost! So, even if a Mylar blanket does what it claims, that is only 80% of 50% (a measly 40%). We only lose about 50% of our heat due to radiation. Undoubtedly, Mylar is an excellent material – but it is not as good as the manufacturers would have you think.įor example, manufacturers often say that space blankets reflect up to 80% of your body heat. ( source) But Mylar Is Incredibly Hyped Up! We lose about 10-15% of our body heat from convection, so a wind barrier like Mylar can do wonders to keep you warm. It will prevent heat from being carried away quickly by the wind (convection heat loss). The windproof property of Mylar is also beneficial. That’s another reason Mylar helps runners stay warm after a marathon – we can lose 85% of our body heat during intense sweating because of evaporation! The waterproof quality means that Mylar can prevent heat loss from evaporation. In addition to being able to reflect heat, Mylar is waterproof and windproof. Mylar helps reflect some of their heat back to them and stabilize their temperatures. Runners’ body temperatures start to drop quickly when they stop running. Mylar is also often given to runners after marathons.
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