Emergency Bivvy That Actually Works: 90% Heat Retention, $34
NASA Mylar technology. Reusable for 100+ trips. Verified warm at 32°F by real customers. 4.91 stars from 213+ buyers. 30-day guarantee - no questions asked.
Get Your Emergency Bivvy - $34
NASA Mylar technology. Reusable for 100+ trips. Verified warm at 32°F by real customers. 4.91 stars from 213+ buyers. 30-day guarantee - no questions asked.
Get Your Emergency Bivvy - $34
Here's the problem: most emergency gear fails when you need it.
That $8 mylar blanket in your pack? It'll tear in the first 10 minutes. The budget bivvy sack? Single-use, heat escapes, you're in trouble.
Sierra Madre was founded in 2010 by Research Mechanical Engineer Richard Rhett. After months traveling the world - climbing, hiking, mountaineering - he discovered the gear he trusted didn't cut it.
Here's exactly what you're getting and why 213+ verified buyers gave it 4.91 stars.
Best for: Hikers, backpackers, car emergency kits, preppers, outdoor workers
Get Your Emergency Bivvy Now - $34| Feature | Sierra Madre | Cheap Alternative |
|---|---|---|
| Heat Retention | 90% (NASA Mylar) | 60-70% |
| Waterproof | Yes | No |
| Reusable | 100+ uses | Single use |
| Rescue Visible | Yes (Orange) | Silver (hard to spot) |
| Price | $34 once | $8 x repeated purchases |
| Trust Rating | 4.91 stars (213+) | Mixed reviews |
| Weight | 6 oz | Varies |
We built this for people who might actually need it. 213+ verified buyers at 4.91 stars agree.
All testimonials from Judge.me verified purchasers
"Tried it outside at 32°F and was just fine, warm!"
"I bought multiple to hand out to unhoused people. As temps dropped into the 20's, these provided warmth and protection from the elements."
"It's smaller than a soda can but unfolds into this huge, waterproof thermal bivy."
"Great company with quality products. They come very compact and can be stashed anywhere."
The Emergency Sleeping Bag uses Mylar - the same material NASA developed for spacecraft insulation.
This isn't marketing fluff. The same thermal reflective technology that protects astronauts from -250°F in space is what keeps your body heat from escaping.
90% heat retention is the physics. The verified reviews are the proof:
"Tried it outside at 32°F and was just fine, warm!" - Verified Buyer
The $8 blanket is single-use, retains only 60-70% heat, and tears in minutes. The $34 bivvy lasts 100+ uses, has 90% heat retention with NASA Mylar, and is verified warm at 32°F by real customers. Cost per use: $8 vs $0.34.
Yes - verified by 213+ buyers at 4.91 stars. Direct quote: "Tried it outside at 32°F and was just fine, warm!" Another used them for humanitarian outreach when temps dropped into the 20s. NASA Mylar technology, field-tested results.
Neither had most rescue victims - until they did. Conditions change. Injuries happen. This weighs 6 oz (smaller than a soda can). The question isn't whether you'll need it. The question is whether your gear will work when you do.
30-day guarantee. Take it on the trail. Test it. If you're not confident it would save you, send it back. No questions, full refund. Plus lifetime warranty for Wildling Members.
Sierra Madre Emergency Sleeping Bag - $34
⏰ Peak season shipping: Order today, ships by Friday.
Take it on the trail. Test it in your backyard. If you're not completely confident this bivvy will keep you safe, return it for a full refund. No questions asked.
NASA Mylar (90% vs 60-70% heat retention), reusable (100+ uses vs single-use), waterproof/windproof. Designed by Research Mechanical Engineer. 4.91 stars from 213+ verified buyers.
84" x 36" - fits most adults up to 6'2". Packs smaller than a soda can at only 6 oz.
Yes. Full waterproof and windproof construction protects from rain, snow, and ground moisture.
30 days, no questions. Test it. If you're not confident, return it. Lifetime warranty for Wildling Members.
For $34, get gear with NASA Mylar technology, 90% heat retention, and 213+ five-star verified reviews.
Get Your Emergency Bivvy Now - $34