Every cup is sealed with a 2 part FDA approved epoxy. If cup is dropped or put in the dishwasher is can crack, seal can be broken, or even shatter. Please handle your tumbler with care. It is highly recommended to not leave tumblers in heat enclosed areas. (Cars, outside, etc...)
Each tumbler will come with a care card and straw. These tumblers are NOT dishwasher safe and should be HAND washed ONLY!