like any good insulation it has gazillions of microscopic dead air spaces that effectively block heat and cold transfer.
A koozie is a foam cover for a can to keep it cold/warm
To keep the house warm
stira foam is a better insulator because it will keep it warm
Foam insulation helps fill gaps and cracks in the walls, preventing drafts and heat loss. This reduces the amount of cold air that can enter the house and warm air that can escape, helping to maintain a more stable temperature inside the home and reduce the need for constant heating.
No.
You can remove stains or blemishes from a polyurethane watch by scrubbing it with a wet terrycloth that has been dipped in a solution of warm water and liquid dish soap. For tough stains, dip a melamine foam sponge into the solution, ring out and wipe the watch gently. Dry well with a clean towel.
The polyurethane is non-porous, which prevents sweat evaporating. Our bodies sweat to cool us down when we're hot. The silver coating reflects heat back towards the body.
Aluminum foil would keep a sandwich warm longer than a foam box. Not sure I would agree with the foregoing: aluminum is a very good conductor of heat and gains (or loses) heat easily. Foam would insullate the sandwich better, minimizing any temperature changes, and therefore would keep it warm (or cold) longer. See the link below for more information
they keep your house warm
turn up the heat
the foam containers help and they also help keep coffee warm.
a clean warm one!