Description
Space Is Cold. Earth Can Be Too. The Same Material That Protects Satellites Is Now in Your Pack.
In 1964, NASA's Marshall Space Flight Center developed a material for the Echo II passive communications satellite: a thin film of metallized polyethylene terephthalate — mylar — capable of reflecting 90% of radiant heat. That same material, virtually unchanged in composition sixty years later, is what you are holding. The Heat Keeper is not a "camping blanket." It is a direct descendant of orbital thermal engineering, repurposed for the terrestrial emergencies — and adventures — where body heat retention becomes a medical necessity, not a comfort preference.
Each blanket is a single sheet of 12-micron aluminized mylar, vacuum-metallized on both sides for bidirectional reflectivity. When wrapped around a body, it reflects 90% of the wearer's radiant heat back inward — maintaining core temperature in conditions as low as -20C. When oriented with the reflective side outward, it deflects solar radiation, providing shade and reducing heat gain by a comparable margin. At 55 grams per blanket, it weighs less than a granola bar. Folded, it occupies less space than a deck of cards. Deployed, it spans 210 cm by 130 cm — enough to wrap an adult, line a shelter, or serve as an emergency ground tarp.
The Heat Keeper is sold in multi-packs because thermal preparedness is not a single-use requirement. Keep one in every vehicle glove box, one in every hiking pack, one in your home emergency kit, and one in your child's school backpack. The material is waterproof, windproof, and reusable for multiple deployments. When the power goes out in a winter storm, when a day hike turns into an unplanned overnight, when a roadside breakdown leaves you waiting two hours in freezing temperatures — the Heat Keeper is the difference between discomfort and hypothermia.
NASA solved the problem of keeping heat in space sixty years ago. The Heat Keeper puts that solution in your hands — at 55 grams and the size of a playing card.
Key Features
- ✦ 90% Radiant Heat Reflection: Vacuum-metallized dual-sided aluminized mylar — bidirectional thermal control for both warmth retention and solar deflection.
- ✦ NASA Heritage Design: Same material family and principle as Echo II satellite thermal shielding (1964) — proven in the most hostile environment ever engineered for.
- ✦ Ultra-Portable: 55 grams per blanket — lighter than a smartphone, folds to the size of a deck of cards, deploys to 210 x 130 cm.
- ✦ Multi-Environment Rated: Effective from -20C to +40C — retains heat in freezing conditions, deflects solar gain in desert heat.
- ✦ Waterproof & Windproof: Continuous non-porous film — blocks precipitation and wind chill with zero absorption or degradation.
- ✦ Reusable: Unlike single-use emergency products, the Heat Keeper can be refolded and redeployed multiple times without structural failure.
- ✦ Multi-Pack Distribution: Sold in packs of 1-20 — designed for systematic placement across vehicles, homes, and outdoor gear sets.
Technical Specifications
- Material: 12-micron polyethylene terephthalate (PET) with vacuum-deposited aluminum
- Thickness: 12 microns (0.012 mm)
- Heat Reflection: 90% of radiant body heat
- Weight: 55 g (1.94 oz)
- Deployed Size: 210 cm x 130 cm (82.7 x 51.2 inches)
- Folded Size: Approximately 10 cm x 7 cm x 2 cm
- Temperature Range: -20C to +40C effective
- Water Resistance: Fully waterproof (non-porous film)
- Metallization: Dual-sided vacuum deposition for bidirectional reflectivity
- Pack Options: 1, 2, 4, 5, 10, 20 pieces
Application Scenarios
Emergency preparedness is the obvious use case, and it remains the most critical one. Every vehicle emergency kit should contain at least two Heat Keepers — one per seat — for winter breakdowns, accidents requiring extended roadside wait times, or unplanned overnight stops in cold weather. Hikers, trail runners, and backcountry skiers: this is 55 grams of insurance against a sprained ankle at sunset, a wrong turn that extends a 3-hour hike into a 7-hour ordeal, or an unexpected temperature drop at altitude. Disaster preparedness organizations — Red Cross chapters, CERT teams, SAR units — buy these by the case because they understand that the number-one preventable cause of death in wilderness and disaster scenarios is hypothermia, and the number-one barrier to carrying thermal protection is weight. The Heat Keeper removes that barrier entirely.
Frequently Asked Questions
Q: Can I really reuse this blanket multiple times?
A: Yes. Unlike the ultra-thin single-use mylar blankets sold at checkout counters, the Heat Keeper uses a 12-micron film that withstands multiple folds and deployments. After use, refold it along the original crease lines and return it to its storage pouch. Visual inspection after each use is recommended — if you see tears or the aluminized coating flaking, retire it.
Q: Will this actually keep me warm in freezing temperatures?
A: It reflects 90% of your body's radiant heat back to you. It does NOT generate heat — it preserves what your body already produces. In -20C conditions, a Heat Keeper wrapped tightly around your core, combined with appropriate layered clothing, can prevent hypothermia for hours. It is not a substitute for a sleeping bag; it is a supplementary thermal barrier that adds 5-10C of effective warmth to whatever insulation system you are already using.
Q: How do I pack it back into the tiny pouch?
A: Spread the blanket flat on a clean surface. Fold it in half lengthwise, then in half again. Starting from the far end, fold accordion-style in 8 cm segments toward the opening. Slide the compressed bundle back into the storage pouch. It will not be as compact as the factory fold, but it will fit.
Q: Does the color matter for heat reflection?
A: No. The thermal performance comes from the aluminized layer, not the exterior tint. All color options — gold, silver, orange, olive — use the same vacuum-metallized core. Choose the color that suits your preference or visibility needs (orange is recommended for emergency signaling).
Q: Can I use this as a ground tarp under my tent?
A: Yes. The waterproof, non-porous film works effectively as a moisture barrier between your sleeping pad and damp ground. Deploy with the reflective side facing up (toward your tent floor) to add a radiant barrier that reflects body heat back into your sleeping system. This is especially effective in winter camping.
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