NBA Officially Licensed Freezer Mug 2 Pack: Home & Away H20 Mug Set (New York Knicks) Officially Licensed by the NBA 15oz mug combines state of the art refreezability with team colors and graphics! Eliminates the need for ice as the technology keeps drinks "crushed ice" cold for hours without the watered down affect of ice! Place in freezer Upside down until frozen solid Top rack dishwasher safe. Do not microwave