Yes
Concrete is one of the worst insulators
It's an insulator. It really depends on the density and thickness of the feathers but usually, it is an insulator
Any featherbed with down or other natural insulator will be great for cold nights and will retain plenty of heat.
It is an insulator.
insulator.
Of those listed, polystyrene balls is the best thermal insulator but polyurethane is better.
Insulator
Insulator
Rubber is an insulator for normal voltages.
insulator
Insulator
Vinyl is an insulator because it has high electrical resistance and does not conduct electricity easily.