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How do emergency blankets work? A thin sheet of aluminized Mylar reflects radiant heat instead of absorbing it, so the warmth a body gives off stays close to the skin, and the foil layer also blocks wind and sheds moisture. The blankets below show how that works in practice, from a bulk pack of thin Mylar sheets to a heavy insulated tarp. Every figure below comes from the Amazon listings.
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How do emergency blankets work: the quick answer
An emergency blanket is a sheet of aluminized Mylar that reflects up to 90% of body heat back toward the body. The foil layer reflects radiant heat, the sheet blocks wind, and the Mylar sheds moisture, so the body loses heat more slowly. Wrap it around the body with the reflective side in, tuck the edges, and use it as a ground cover, a shelter layer or a signal when needed. The steps below show how to use one and how the picks below differ.
Step 1: Wrap it reflective side in
Wrap the blanket around the body with the reflective side facing in, so the foil reflects heat back toward the body. Primacare states that its foil cover can reflect heat back to the body or deflect heat from the sun, so the same side that warms also shades. Tuck the edges under the body or around the shoulders to hold the warm air in. A loose blanket lets heat escape, so keep it close.
Step 2: Block wind and moisture
A blanket that flaps in the wind loses heat fast, so use it as a wind block or a shelter layer. The ANLOKE blanket (on Amazon) blocks wind, and the Arcturus tarp (on Amazon) uses a 3-layer design of reflective Mylar and polypropylene to block wind and moisture. The Arcturus tarp has 4 reinforced grommets to fasten it as a tarp, ground cover, wind block or emergency shelter. The Mart Cobra blanket (on Amazon) works as a ground cover under a sleeping bag, and the ANLOKE blanket works as a rain poncho or a bivouac sack.
Step 3: Pick the size and pack for the kit
Match the blanket to the kit. The Mart Cobra 100-pack suits a shelter or a car kit with a blanket for many people, while the Primacare and ANLOKE 10-packs suit a family kit or a go bag. The ANLOKE blanket measures 84 by 64 inches, the Primacare blanket measures 84 by 52 inches, and the Mart Cobra blanket measures 82 by 52 inches. The Arcturus tarp measures 60 by 82 inches and packs into an included carry bag.
Step 4: Reuse it or replace it
Mylar blankets are listed as reusable. The Mart Cobra and ANLOKE blankets are listed as reusable, and the Arcturus tarp is listed as reusable with a carry bag. Fold the blanket after use, keep it in its package or bag, and check it for tears before the next trip. Primacare does not state reuse in its listing.
Emergency blankets for the kit
Each step above needs a blanket matched to its use: a thin Mylar sheet for warmth, a wide blanket for cover and a grommeted tarp for shelter.
| # | Product | Solar Score | Buy |
|---|---|---|---|
| 1 |  ANLOKE Emergency Blankets | 9.6/10 | Buy on Amazon |
| 2 |  Mart Cobra 100-Pack Blankets | 9.6/10 | Buy on Amazon |
| 3 |  Arcturus Insulated Tarp | 9.6/10 | Buy on Amazon |
| 4 |  Primacare HB-10 Blankets | 9.5/10 | Buy on Amazon |
ANLOKE Emergency Blankets
A 10-pack of dual-sided Mylar blankets, 84 by 64 inches, that retain up to 90% of body heat.
Pros
- 84 by 64 inches, the widest stated blanket in this group
- 15 micrometers thick, larger and stronger than most emergency blankets
- Each blanket is individually folded, wrapped and sealed
- Retains up to 90% of body heat for first aid and go bags
Cons
- No warranty term is stated
- No stated total weight for the 10-pack
- 24% larger claim has no stated standard size to check against
Detailed Review
The listing states a 10-pack of dual-sided aluminized Mylar blankets, each 84 by 64 inches and 15 micrometers thick, individually folded, wrapped and sealed. It claims the blanket is 24% larger than a standard mylar blanket and retains up to 90% of body heat. Each blanket weighs about 2 ounces and folds to a 6 by 4 inch package. The listing gives many uses: bivouac sack, backpack cover, rain poncho, emergency signal, shade cover, dust shield, arm sling, sleeping bag liner, wind blocker, water collector and trail marker. The spec table lists about 82 by 64 inches, which does not match the 84 by 64 inches in the bullets; trust the bullets.
Who it's for: campers and preppers who want a wide 84 by 64 inch blanket in a sealed 10-pack for go bags and first aid kits. Who should skip it: owners who need a tarp with grommets, which the Arcturus blanket provides instead.
Its Solar Score of 9.6/10 comes from performance 32/35, build 22/25, value 21/25, safety 5/10 and warranty 0/5: 80 of 100 points, placed on our 9.2 to 9.8 scale.
Key Specifications
| Size | 84 x 64 in |
|---|---|
| Thickness | 15 micrometers |
| Pack | 10-pack |
| Weight | About 2 ounces |
Taken from the seller's listing on 13 November 2026. Capacity and output figures are rated by the manufacturer.
Safety and Warranty
What this listing states. Retains up to 90% of body heat; helps prevent hypothermia and shock, so safety scores 5 of 10. No warranty term, so warranty scores zero. See How We Pick.
Follow the manual. Connect and use the product as the maker describes, stay within every stated rating, and read the manual before first use.
This is general buying information, not professional advice. Follow each product manual and local rules, and see our Safety Disclaimer.
Mart Cobra 100-Pack Blankets
A 100-pack of tear-resistant Mylar blankets, 82 by 52 inches, that retain up to 90% of body heat.
Pros
- 100-pack suits a shelter or a car kit
- Tear-resistant Mylar, reusable for multiple uses
- Retains up to 90% of body heat
- 82 by 52 inches, folds down to a compact size
Cons
- No warranty term is stated
- No stated carry bag or individual wrapping
- No stated individual package size
Detailed Review
The listing states a 100-pack of aluminized Mylar blankets, each 82 by 52 inches, that retain up to 90% of body heat. The Mylar is tear-resistant and reusable, and the blankets fold down to a compact size for a bug out bag, backpack, car or emergency kit. The listing gives ground cover, shelter and hypothermia and shock prevention as uses. The spec table gives a weight of 0.12 pounds and a thickness of 0.00047244 inches, figures too precise to read as a plain per-blanket weight. No warranty term is stated.
Who it's for: shelters, car kits and group kits that need a blanket for many people at once. Who should skip it: owners who want a single heavy blanket with grommets, which the Arcturus tarp provides instead.
Its Solar Score of 9.6/10 comes from performance 30/35, build 21/25, value 22/25, safety 5/10 and warranty 0/5: 78 of 100 points, placed on our 9.2 to 9.8 scale.
Key Specifications
| Size | 82 x 52 in |
|---|---|
| Pack | 100-pack |
| Material | Aluminized Mylar |
| Heat retained | Up to 90% of body heat |
Taken from the seller's listing on 13 November 2026. Capacity and output figures are rated by the manufacturer.
Safety and Warranty
What this listing states. Retains up to 90% of body heat; helps prevent hypothermia and shock, so safety scores 5 of 10. No warranty term, so warranty scores zero. See How We Pick.
Follow the manual. Connect and use the product as the maker describes, stay within every stated rating, and read the manual before first use.
This is general buying information, not professional advice. Follow each product manual and local rules, and see our Safety Disclaimer.
Arcturus Insulated Tarp
A reusable 3-layer insulated tarp, 60 by 82 inches, with 4 reinforced grommets and a carry bag.
Pros
- 3-layer design of reflective Mylar and polypropylene
- 4 reinforced grommets fasten it as a tarp or shelter
- Reflects 90% of body heat
- Carry bag included for storage
Cons
- No warranty term is stated
- Single blanket in the box
- No stated thickness in inches for the 3 layers
Detailed Review
The listing states a reusable 3-layer insulated tarp, 60 by 82 inches, that reflects 90% of body heat. The layers combine reflective Mylar and rugged polypropylene to retain body heat while blocking wind and moisture. It weighs about 1.4 lbs in the bullets, while the spec table lists 0.99 pounds; trust the bullets. It has 4 reinforced grommets to fasten it as a tarp, ground cover, wind block or emergency shelter, and it packs into an included carry bag. No warranty term is stated.
Who it's for: campers and overlanders who want a blanket that doubles as a tarp with grommets. Who should skip it: owners who want a light 10-pack or 100-pack of thin Mylar sheets for a kit.
Its Solar Score of 9.6/10 comes from performance 30/35, build 22/25, value 19/25, safety 6/10 and warranty 0/5: 77 of 100 points, placed on our 9.2 to 9.8 scale.
Key Specifications
| Size | 60 x 82 in |
|---|---|
| Layers | 3-layer Mylar and polypropylene |
| Grommets | 4 reinforced grommets |
| Weight | About 1.4 lbs |
Taken from the seller's listing on 13 November 2026. Capacity and output figures are rated by the manufacturer.
Safety and Warranty
What this listing states. 3-layer design with reflective Mylar and polypropylene blocks wind and moisture, so safety scores 6 of 10. No warranty term, so warranty scores zero. See How We Pick.
Follow the manual. Connect and use the product as the maker describes, stay within every stated rating, and read the manual before first use.
This is general buying information, not professional advice. Follow each product manual and local rules, and see our Safety Disclaimer.
Primacare HB-10 Blankets
A 10-pack of silver Mylar thermal blankets, 84 by 52 inches, that retain 90% of body heat.
Pros
- 84 by 52 inches with a silver reflective finish
- Retains 90% of body heat
- Foil cover reflects heat back to the body or deflects heat from the sun
- Made in the United States
Cons
- No warranty term is stated
- Weight figure of 0.5 pounds does not say if it covers one blanket or the pack
- No stated reuse in the listing
- No stated thickness or layer count
Detailed Review
The listing states a 10-pack of silver Mylar thermal blankets, 84 by 52 inches, that retain 90% of body heat. The Mylar insert provides insulation and the foil cover can reflect heat back to the body or deflect heat from the sun. The listing names survival, first aid, outdoors, camping and EMS as uses. The spec table gives a 0.5-pound weight without saying if that covers one blanket or the pack. No warranty term is stated.
Who it's for: first aid kits and EMS bags that need a reflective blanket in a standard size. Who should skip it: owners who want a reusable blanket, which Primacare does not state in its listing.
Its Solar Score of 9.5/10 comes from performance 29/35, build 20/25, value 20/25, safety 5/10 and warranty 0/5: 74 of 100 points, placed on our 9.2 to 9.8 scale.
Key Specifications
| Size | 84 x 52 in |
|---|---|
| Pack | 10-pack |
| Material | Silver Mylar |
| Heat retained | 90% of body heat |
Taken from the seller's listing on 13 November 2026. Capacity and output figures are rated by the manufacturer.
Safety and Warranty
What this listing states. Reflective foil retains 90% of body heat for first aid use, so safety scores 5 of 10. No warranty term, so warranty scores zero. See How We Pick.
Follow the manual. Connect and use the product as the maker describes, stay within every stated rating, and read the manual before first use.
This is general buying information, not professional advice. Follow each product manual and local rules, and see our Safety Disclaimer.
As an Amazon Associate I earn from qualifying purchases.
Ways to make a blanket last longer
- Fold the blanket back into its package after use, so it stays flat and ready.
- Keep the Arcturus tarp in its carry bag between trips.
- Store the 10-pack and 100-pack blankets dry, in a car kit or a go bag.
- Use the blanket as a ground cover or a signal when warmth is not the need.
FAQ: power away from the grid
Do emergency blankets really retain 90% of body heat?
That is the figure the listings state: Mart Cobra, Primacare, ANLOKE and Arcturus each list up to 90% of body heat retained or reflected. The figure comes from the makers, not from a measurement in this guide.
Which side faces the body?
The reflective side faces in for warmth. Primacare states that its foil cover can reflect heat back to the body or deflect heat from the sun, so the reflective side goes toward the body for warmth and away from the body for shade.
Are emergency blankets reusable?
Mart Cobra, ANLOKE and Arcturus list their blankets as reusable. Primacare does not state reuse in its listing.
What size is an emergency blanket?
The blankets in this guide measure 82 by 52 inches, 84 by 52 inches, 84 by 64 inches and 60 by 82 inches. The ANLOKE 84 by 64 inch blanket is the widest stated in this group.
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