Why two thin blankets put together are warmer than one blanket of double the thickness ?

Assertion : Two thin blankets put together are warmer than a single blanket of double the thickness. Reason : Thickness increases because of air layer enclosed between the two blankets.

Why are two thin blankets are warmer than a single blanket of double the thickness?

Why are two thin blankets are warmer than a single blanket of double the thickness?

Two shirts are warmer than a single shirt of double the thickness. Why ?

Why two layers of cloth of equal thickness provide warmer covering than a single layer of cloth of double the thickness?

Why do two layers of cloth of equal thickness provide warmer covering than a single layer of cloth of double the thickness?

Two thin blankets keep more hotness than one blanket of thickness equal to these two. The reason is

Two layers of cloth of equal thickness provide warmer covering than a single layer of cloth of double the thckness, because they .