Material: Double-walled, vacuum-insulated 18/8 food-grade stainless steel
Features: The double-wall construction and copper insulation allow beverages to stay cold for up to 24 hours and hot for at least 6 hours. It is also designed to be sweat-free and rust-proof.
Lid: It comes with a removable, BPA-free, splash-proof lid that is often straw-friendly.