State-Of-The-Art refreezable crystal technology keeps drinks cold for hours without using ice and won't water down your drink. Just store it in the freezer and it's ready to go for hours of cold beverages. Tightly sealed lid with straw resists spills for extra portability The built in straw goes to the bottom so you get to enjoy the whole drink. Team color lid makes them stylish too! BPA and Lead free, safe to use, Use them at home or on the go - this is a great and versatile tumbler!