its a good insulator, meaning that yes, it is a good non-conductor. Materials that insulate heat, eg wool, cotton etc, are also by definition good electrical insulators. Good conductors would include most metals, which you may have noticed are bad insulators. you wouldn't wear metal underwear anyway!
Because they trap more air.
Blankets are defined to be insulators.
nylon,fur,wool,hardrubber,glass,plastic,sand,papper and your hair
Feathers are good insulators because they trap air. Motionless air is a very good insulator.
There are many different types of insulators. Fleece is probably the best insulator that I have tested. Wool is next. But I do not know about pure wool. The wool that I had had rayon in it, so pure wool might come out with different results.Cotton and vinyl are also good insulators. I tried to use burlap, but it had so many holes in the material that it wasn't a very good insulator.
wool is a insulator
Examples of good insulators are : glass, plastic, wood, cotton, aerogel, sand, paper, wool etc. The easiest to find are wool and cotton. Just look for a sock for example.
Blankets, wool, and that itchy yellow fibreglass in attics are examples of good insulators, as heat does not easily pass through them. Anything that's dense is a good insulator.
Wool, Nylon, Cotton
A material or an object that does not easily allow heat, electricity, light, or sound to pass through it. Air, cloth and rubber are good electrical insulators; feathers and wool make good thermal insulators.