The Thermos 12 Oz. FUNtainer Stainless Steel Bottle keeps drinks cold for up to 12 hours. The double wall stainless steel construction is built to handle drops, dings and assorted roughhousing. Featuring a hygienic, push-button lid, this bottle is easy to open and drink from. To clean, you can pop your Batman FUNtainer Bottle in the dishwasher; however washing by hand is recommended.