Mylar emergency blanket

Mylar emergency blanket used to retain body heat in survival situations, rescue operations, and outdoor activities.

About this subject

The Mylar emergency blanket, typically made from polyethylene terephthalate (PET) film coated with a reflective metallic layer, is a staple in survival kits. Its primary purpose is to reflect up to 80% of the body's radiated heat, preventing hypothermia in cold exposure scenarios. Originally developed by NASA for the space program in the 1960s, the technology was later adapted for civilian use and became standard in first aid kits, camping backpacks, and rescue vehicles.

Beyond heat retention, the blanket can be used as a ground cover, makeshift rain poncho, or emergency signal due to its shiny surface that reflects sunlight. In desert environments, it can be reversed to reflect external heat and keep the body cooler. Despite its fragility, the blanket is extremely compact and lightweight, occupying minimal space and weighing less than 60 grams.

A practical note: the Mylar blanket is not breathable, meaning sweat can accumulate and reduce its effectiveness if used for extended periods. Therefore, survival strategies often recommend combining it with other insulating layers. More durable versions with reinforced polyethylene are also available for repeated use.

In the United States, these blankets are widely distributed in emergency preparedness kits, marathons (as finisher blankets), and by organizations like FEMA. Brands such as Adventure Medical Kits and Surviveware dominate the market, but generic versions are available at camping stores and online. Proper knowledge of how to use a Mylar blanket can be a critical factor in survival situations.

Frequently Asked Questions

What is a Mylar emergency blanket?

It is a thin, lightweight blanket made of metalized plastic film (PET) that reflects body heat. Used in first aid, camping, and survival situations to prevent hypothermia.

How does the Mylar blanket work?

It reflects up to 80% of the body's radiated heat back to the skin, creating a barrier against cold. It can also be used to reflect solar heat in hot climates by turning the shiny side outward.

Can a Mylar blanket be reused?

Yes, but with caution. Disposable models are fragile and tear easily, making them suitable for one-time use. Reinforced versions (with thicker polyethylene) can be reused several times if handled carefully.