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Insulation. Styrofoam insulates much more effectively than plastic, which means your cold drinks stay colder longer and your hot drinks stay hotter. Plastic cups are not recommended for hot drinks, and they do not have the insulation properties of Styrofoam.
Styrofoam because it has a thick layer and is a good insulator.Paper and plastic are could alternatives but Styrofoam would work better, therefore glass would be the worst one â¦ to use because it would only keep it warm for a couple of minutes.