Windows are particularly difficult to insulate compared to roof and walls. Thick layers of overlying sediment insulate and trap in the deeper heat. It is also used to insulate piping and for soundproofing. Other animals have adapted layers of fur or feathers to insulate them from the cold. Feathers insulate birds from water and cold temperatures. The air layer also helps insulate the birds in cold waters. The iron was varnished to insulate it from the windings. This greenery functions to help insulate the nest. Without myelin to insulate neurons, nerve signals quickly lose power. The ego creates an enemy in order to insulate itself from culpability. Transformer oil's primary functions are to insulate and cool a transformer. They are used primarily for defense, but also serve to insulate their bodies during winter. The purchaser of property becomes liable for the loan taken out to insulate the property. The election system was complex and designed to insulate the government from grass roots democracy. Hughes insisted on using tissues to pick up objects to insulate himself from germs.