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.

Fabric Type	Mylar
Product Care Instructions	Hand Wash Only
Unit Count	4 Count
Item Thickness	0.01 Inches
Item Weight	8.32 ounces
Size	84" x 55"
Item Dimensions L x W	84"L x 55"W
Water Resistance Level	Waterproof
Fabric Warmth Description	Heavyweight
Recommended Uses For Product	Travel, Napping, Camping, Hiking
Seasons	All
Special Feature	Waterproof
Pattern	Star
Sport Type	Fishing, Camping, Hiking
Blanket Form	Emergency Blanket
Theme	Space
Color	Silver
Style Name	Compact

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

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