Mylar emergency blanket

The Mylar emergency blanket, also called a space blanket, is a survival essential that reflects up to 80% of body heat, keeping you warm in cold environments.

About this subject

The Mylar emergency blanket is a aluminized polyester sheet developed by NASA in the 1960s to protect satellites and space equipment. It has since become a staple in first aid kits, hiking backpacks, and outdoor survival gear. Its reflective surface blocks up to 80% of radiant heat loss, making it highly effective for preventing hypothermia in cold or windy conditions. Weighing only about 50 grams, the blanket is compact, waterproof, and can also serve as a windbreak or ground cover.

Beyond thermal insulation, the Mylar blanket has multiple survival uses. It can be deployed as a moisture barrier, a rain collector, a reflective signal for rescuers, or an improvised shelter when tied to branches. However, its durability is limited: the material is thin and easily tears, requiring careful handling. Disposable versions are common in marathons, given to runners after the race to prevent chilling.

Interestingly, the same reflective principle is used in thermal wraps for premature infants, who lose heat rapidly. Studies show that a Mylar blanket can raise core body temperature by up to 2°C when used properly. However, experts caution that it should not replace a proper sleeping bag or be worn directly against the skin for long periods, as it can trap moisture and cause discomfort.

Frequently Asked Questions

Can a Mylar emergency blanket be reused?

Yes, if it is not torn, it can be folded and reused. However, the material is fragile and tends to lose efficiency over time.

How do you use a space blanket in an emergency?

Wrap it around your body with the silver side facing inward to reflect heat. It can also be used as a hood or waterproof cover.

What is the difference between a Mylar blanket and a regular blanket?

A Mylar blanket is made of ultra-thin metallized polyester that reflects heat and is waterproof, while a regular blanket traps heat through thickness but does not reflect radiation.