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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QIO CHUANG Emergency Mylar Thermal Blankets -Space Blanket Survival kit Camping Blanket (4-Pack). Perfect for Outdoors, Hiking, Survival, Bug Out Bag ，Marathons or First Aid 1

Product ID: 81807158

Details

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

🎒Compact & portable 4-pack

💧Waterproof & windproof

🔥Retains 90% body heat

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Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔥 Stay warm, dry, and prepared—because survival is the new luxury.

FAMILY READY VALUE - 4-pack ensures everyone stays protected, making it the smart choice for group adventures or emergency kits.
ULTIMATE HEAT SHIELD - Reflects and retains up to 90% of your body heat to prevent hypothermia in any emergency.
WEATHERPROOF WARRIOR - Durable aluminized Mylar construction keeps you dry and protected from rain, wind, and snow.
PACK LIGHT STAY READY - Individually folded and sealed for ultra-compact storage—perfect for bug-out bags and on-the-go survival.
VERSATILITY MEETS SURVIVAL - Use as a shelter, ground cover, poncho, or emergency signal—your all-in-one outdoor lifesaver.

The QIO CHUANG Emergency Mylar Thermal Blankets (4-Pack) are lightweight, waterproof, and windproof survival essentials designed to retain up to 90% of body heat. Each compact blanket is individually sealed for easy storage and multi-functional use, from emergency warmth to shelter and ground cover. Perfect for outdoor enthusiasts, first aid kits, and bug-out bags, this durable set offers reliable protection in all weather conditions, making it a must-have for any preparedness-conscious professional.

Specifications

ASIN	B07GLCYR5S
Additional Features	Waterproof
Age Range Description	Adult
Best Sellers Rank	#1,604 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #2 in Camping Emergency Blankets
Blanket Form	Emergency Blanket
Brand Name	QIO CHUANG
Color	Orange
Customer Reviews	4.7 4.7 out of 5 stars (8,343)
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	0.52 Pounds
Manufacturer	QIO CHUANG
Manufacturer Part Number	JIJIU-4018
Material Type	Polyethylene (PE)
Model Number	JIJIU-4018
Number of Items	4
Pattern	Star
Product Care Instructions	Machine Wash
Recommended Uses For Product	Camping, Hiking, Emergencies
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	4.0 Count
Water Resistance Level	Waterproof

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