Keeps beverages hot or cold for up to 24 hours with double-wall vacuum insulation. The narrow tumbler mouth helps minimize heat transfer to maintain the desired temperature. Material and construction - Double-wall stainless steel: inner layer 316 stainless steel; outer layer 304 stainless steel. Corrosion-resistant. - Cup surface coated with a plastic layer; lid made from BPA-free food-grade PP. Leak-proof design - Sealed lid with an internal sealing ring prevents leakage. - Suitable for work, gym, car, bicycle (fits standard bottle holders), or other on-the-go use. Care and maintenance - If you fill hot soup, rinse quickly to remove any odors or residues, so you can use it as a kettle-like bottle with water the next day. Use scenarios - Office or commuting: keep coffee hot or water cold for hours during the day. - Gym or outdoor activities: reliable hydration with temperature maintained during workouts. - Travel or on the road: fits standard bottle holders on cars or bicycles and travels without leaks.