Wash the empty cup and put it in the freezer, Freeze the Freezing gel into ice by 2-4 hours. Take it out and pour your beverage or beer in. which will be cooled down soon and keep cool for 1-2 hours. Temperature can range from -10℃ to 70℃. Several colors are available for choice. logo can be customized by Silkscreen. Great options for party or outdoors promotional giveaway. Pls contact our info center for more details.