This 17 ounce double wall stainless steel thermal bottle is great for hot or cold drinks. The stainless steel insulated lid, narrow opening, vacuum insulated body and copper plated inner wall help to retain the internal temperature longer. The inner wall can make a difference of 41 degrees over 24 hours and prevents heat from entering or exiting the bottle by thermal radiation. Keeps hot for 12 hours and cold for 24 hours. Do not microwave or place in dishwasher.