Everything You Need to Know About Space Blankets

When it comes to lightweight, portable, and effective tools for survival and emergency preparedness, few items rival the emergency space blanket. Whether you’re a seasoned adventurer, a casual camper, or someone building an emergency kit for your home or car, these shiny, metallic blankets are worth considering. But what makes them so special, and how do they work? Let’s dive into the science, uses, and tips for getting the most out of these compact lifesavers.

What Are Emergency Space Blankets?

Emergency space blankets, also known as Mylar blankets or thermal blankets, are ultra-thin sheets made of heat-reflective material. Originally developed by NASA for the U.S. space program, these blankets are designed to reflect up to 90% of your body heat back to you.

Their lightweight and foldable design make them easy to pack, while their durable construction ensures they can withstand various environmental conditions. You’ll often find them in first aid kits, survival gear, and even at marathons.

Child using space blanket

How Do They Work?

The magic of space blankets lies in their material. Mylar is a type of polyester film coated with a thin layer of metallic alloy. This layer reflects radiant heat—the energy your body naturally emits—back toward you, helping you retain warmth.

Unlike traditional blankets, which insulate by trapping air, space blankets primarily rely on reflection to keep you warm. While they won’t generate heat themselves, they’re incredibly effective in reducing heat loss from radiation, convection, and evaporation.

When and Where to Use Space Blankets

  1. In Emergency Situations
    Space blankets are essential in situations where warmth is critical—such as being stranded in your car during winter, waiting for rescue, or treating someone in shock or hypothermia.
  2. Camping and Hiking
    Unexpected weather changes can leave you cold and wet. Space blankets provide an extra layer of protection, whether used as a makeshift shelter, ground cover, or even a windbreaker.
  3. In Survival Kits
    Compact and versatile, space blankets are a must-have for bug out bags and 72-hour emergency kits.
  4. First Aid Applications
    Beyond warmth, these blankets can act as a sterile surface for injuries or be used to signal for help thanks to their reflective surface.
  5. Disaster Response
    Emergency responders often distribute space blankets after earthquakes, floods, or fires to help displaced individuals retain body heat.

Woman comforting youth in space blanket

Creative Uses for Space Blankets

  • Waterproofing: Use them as a tarp to keep supplies dry or cover yourself during rain.
  • Signal Mirror: The reflective surface can catch sunlight to signal rescuers.
  • Shelter Building: Combine a space blanket with paracord to create an effective rain or sun shield.
  • Food Preparation: Use them to reflect heat when cooking with solar ovens.
  • Gardening: Some people even use space blankets as ground covers to retain soil warmth for plants.

Tips for Using Space Blankets

  1. Avoid Tears: Mylar is strong but can puncture if mishandled. Carry duct tape for quick repairs.
  2. Combine with Other Gear: Layering a space blanket over or under a sleeping bag enhances its effectiveness.
  3. Secure in Windy Conditions: Use rocks, clips, or stakes to hold the blanket in place.
  4. Be Mindful of Condensation: Prolonged use can trap moisture. Ventilate as needed to stay dry.

Are There Any Downsides?

While space blankets are highly effective in short-term emergencies, they are not designed for extended use or extreme environments. They can tear under heavy stress, don’t breathe well, and don’t insulate as effectively as wool or down when used alone.

Stocking Up on Space Blankets

At Total Prepare, we believe every kit should include at least one emergency space blanket. They’re cost-effective, multipurpose, and potentially life-saving. They fit anywhere, and at $2, why not keep one in your purse, car, and at the office?

Final Thoughts

Emergency space blankets may be simple in design, but their potential is vast. Whether you’re preparing for unexpected weather, building a survival kit, or planning your next outdoor adventure, having one of these reflective blankets on hand can make all the difference.

Ready to add one to your kit? Shop here. Stay safe, stay prepared!