Double Wall Stainless Steel Coffee Mug: Made of high quality stainless steel, durable and unbreakable. BPA-free, lead-free, kids and adults can use it with peace of mind Leak-proof and spill-proof lid: BPA-free screw-on lid, plus the silicone sealing ring to prevent water leaks. It features a spill-resistant flip-top lid for easy drinking, just open the sip hole. The inner square design and the outer circle of the lid make it easy to open. Twist to open for quick filling and easy cleaning Non-slip handle and bottom: The matte silicone body not only makes the insulated mug stylish, but also provides a comfortable way to hold. And the rubber bottom helps prevent the coffee cup from slipping and tipping over. Also, the bottom diameter of the cup is 70mm, specially designed for in-car use Keeps drinks cold or hot for hours --- Vacuum-sealed double-wall design allows the reusable coffee mug keeps beverages cold or hot for up to 6 hours Functional style: store your leak-proof, spill-proof insulated mug in your bag, backpack, or suitcase without worrying about spills or leaks. Take it anywhere you want to go, office, school, travel, party, etc. Enjoy the good day and a nice drink