30 oz Stainless Steel Tumbler - BPA Free Lid Open/Close with Straw Opening - Double-Wall Insulated Travel Cup & Coffee Mug 18/8 FOOD GRADE STAINLESS STEEL DESIGN for both the exterior and interior. This will keep cold drinks cold for over 24 hours and warm drinks warm for hours. EXTREMELY DURABLE - Double walled vacuum insulated for great temperature retention. Fill it with cocktails, soda, water, beer, lemonade, tea, coffee, soup. NO SWEAT - Double wall technology prevents any temperature change to the exterior. No "painted on" logo to dissolve over time. Whether you have hot tea or ice cold lemonade, the stainless steel on this cup will feel the same in your hand. EASY TO CLEAN - large wide mouth opening allows easy access to wash the stainless steel surface without any hard to reach spots. The clear sliding (open / close) lid is dishwasher safe. BPA FREE / ENVIRONMENTALLY FRIENDLY - Healthier alternative to plastic bottles and cups. Save money on disposable cups that won't keep your liquids hot or cold. 100% SATISFACTION GUARANTEE - If you are unsatisfied with your tumbler, please return it within the first 30 days for a full refund. There is no risk when purchasing a Royal Tumbler!