Would this work to put under a sheet in a crib to keep babies bed warm?

They do work for an outside feral cat I am caring for. I put a sheet under a blanket to keep cat warm and it is warm. but cat was scared of the the crunching sound. I used one blanket and it keeps you warm. I believe putting one under baby blanket would help keep baby warm.

Are these puncture proof? Do they tear easily?

Compared to similar mylar blankets, they are sturdier and longer lasting. However, they will puncture, and they will tear. They are not like regular blankets, not like tarps or similar things. They are not made for rough handling, but for heat and protection while sleeping or in emergency situations.

How many microns in thickness?

don't know the micron. it does have a mesh-like structure, almost like ripstop. it is light and durable. thicker than what foil balloons are made of but thinner and more flexible than tinfoil. I have worn it in -30 F and its worked wonders.

Odd question. can these block radio interference? i have a neighbor who plays with a cb radio and i pick up his transmissions and it's annoying.

Hell no . You need copper . Copper blocks all radio frequency

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Emergency Mylar Thermal Blankets 4 Packs Survival Kit 84''x55''

Product ID: 81807158

Details

Brand
QIO CHUANG
Color
Orange
Material
Polyethylene
Special Feature
Waterproof
Style
Compact

💧Waterproof & windproof

📏Generous 84''x55'' size

🔥Reflects 90% body heat

R743

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Description

🔥 Stay warm, dry, and ready—because survival is the ultimate power move.

ALL WEATHER SHIELD - Waterproof and windproof design keeps you dry and protected in any environment.
COMPACT POWER PACK - Four individually sealed blankets, perfect for bug-out bags and emergency kits.
DURABLE REUSABLE - Heavyweight Mylar fabric built to withstand harsh conditions and multiple uses.
HEAT RETENTION MASTERY - Locks in up to 90% of your body heat to fend off hypothermia and shock.
VERSATILE SURVIVAL ESSENTIAL - Use as ground cover, shade, emergency shelter, or even a solar oven—limitless uses for the modern adventurer.

The QIO CHUANG Emergency Mylar Thermal Blankets 4-Pack offers a compact, durable, and versatile solution for emergency preparedness. Each 84''x55'' blanket reflects up to 90% of body heat, is waterproof and windproof, and can be reused in countless survival scenarios—from camping to first aid. Trusted by thousands with a 4.7-star rating, these blankets are a must-have for any professional’s bug-out bag or outdoor kit.

Specifications

ASIN	B07GLCYR5S
Additional Features	Waterproof
Age Range Description	Adult
Best Sellers Rank	#132 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #3 in Camping Emergency Blankets
Blanket Form	Emergency Blanket
Brand Name	QIO CHUANG
Color	Orange
Customer Reviews	4.7 4.7 out of 5 stars (8,570)
Embellishment Feature	No Embellishment Feature
Fabric Type	Mylar
Fabric Warmth Description	Heavyweight
Fill Material	Polyester
Global Trade Identification Number	00707516010928
Item Dimensions L x W	84"L x 55"W
Item Thickness	0.01 inches
Item Weight	8.32 ounces
Manufacturer	QIO CHUANG
Manufacturer Part Number	JIJIU-4018
Material Type	Polyethylene (PE)
Model Number	JIJIU-4018
Number of Items	4
Number of Packs	4
Pattern	Star
Product Care Instructions	Machine Wash
Recommended User Type	Adult
Recommended Uses For Product	Camping, Hiking, Napping, Travel
Seasons	All
Size	84 inches x 55 inches
Sport Type	Camping, Fishing, Hiking
Style Name	Compact
Subject Character	elf
Theme	Space
UPC	707516010928
Unit Count	4 Count
Water Resistance Level	Waterproof

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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TrustScore 4.5 | 7,300+ reviews

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Great price for an authentic product. Fast international shipping too!

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R743

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to South Africa.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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