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Still air is a good thermal insulator. In fact trapped air is the principle behind numerous insulating materials such as foam, blown fiberglass, blown cellulose and bedding materials.
– Katie Epps
Commented Mar 25, 2021 at 12:32
1

@MicahEpps: Air is only a good thermal insulator if it doesn't move between regions with different temperatures. If a vertical space separates two sheets of material at different temperatures, air in contact with the hotter side will be less dense than air that's in contact with the bottom side, resulting in convection currents. Other gases may reduce heat transfer compared with air
– supercat
Commented Mar 25, 2021 at 18:09

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