Thermal conductivity of air is less than that of felt, but is better insulator in comparison to air why?

Thermal conductivity of air is less than that of felt, but is better i

1.	Thermal conductivity of air is less than that of felt, but is better insulator in comparison to air why?
Answer» Solution :Felt contains fine HOLES in which air is trapped. This air trapped is not free to move in these holes. So convection is not possible. Besides this as felt is a bad conductor, CONDUCTIONIS also not possible. Like this felt is better insulator in comparison to air.