These foam cups are insulated to help maintain beverages at their ideal temperature and quality. Because they are insulated, they do not transfer heat, allowing the drink to stay warm while your fingers stay cool and comfortable. The seamless, one-piece construction reduces the risk of leaks and provides a premium drinking experience. Cup Type: Hot Cup; Interior Volume Capacity: 12 oz; Material(s): Expanded Polystyrene (EPS); Material Type: Foam.