The double wall stainless steel coffee mug is made of high quality stainless steel, which is durable and unbreakable. BPA free and lead free, both kids and adults can use it comfortably.Leak and Spill Proof Lid- BPA free screw cap, along with silicone sealing ring to avoid water leakage. It has a flip-up and splash-proof lid for convenient drinking, just need to open the drinking hole. Square inner design and round outer lid design make it easy to open. Twist it open for quick filling and easy cleaningThe matte silicone body of the mug not only makes the thermal mug look stylish, but also provides a safe and comfortable way to grip it. The rubber bottom helps prevent the coffee mug from slipping and tipping. The bottom diameter of the cup is also 70mm, specially designed for car useKEEP YOUR DRINKS COLD OR HOT FOR HOURS- Equipped with double wall and vacuum sealed design, the reusable coffee cup can keep your drinks cold or hot for up to 6 hoursPRACTICAL STYLE- You can pack the leak-proof and spill-proof insulated cup in your bag, backpack or luggage without any worry about spills or leaks. You can take it anywhere you want to go, to the office, school, travel, parties and more. Enjoy the beautiful day and the nice drinks!