Many materials such as glass, wood, plastic, asbestos, fiberglass and dead air space are poor heat conductors and therefore good insulators.
(Many materials such as glass, wood, plastic, asbestos, fiberglass and dead air space; are; poor heat conductors and therefore good insulators)
Many materials such as glass, wood, plastic, asbestos, fiberglass and dead air space
are
poor heat conductors and therefore good insulators