Durable and Healthy Material: Our flip-lock thermos is made with food-grade 304 (18/8) stainless steel interior. The BPA-free PP plastic lid features a removable silicone plug and sealing ring for a secure seal. The exterior is crafted from stainless steel with an eco-friendly paint finish, offering beautiful color, rust resistance, and wear resistance. It's more shatterproof than other glass models. Vacuum Insulated Travel Mug: Double-walled stainless steel thermos with vacuum welding technology to reduce heat conduction, delay temperature changes, and keep your drinks hot or cold for 6 to 10 hours. Perfect for long work hours or travel, ensuring your beverages are always at the ideal temperature. Lightweight & Leak-Proof: Available in two capacities, 320ml and 450ml. Its compact size makes it easy to carry, allowing for one-handed drinking with a simple open and close mechanism. The lid's button includes a lock mode to enhance leak-proof security, preventing accidental opening in your bag or backpack. Wide Range of Use: The direct-drink thermos is suitable for brewing coffee, tea, and milk, or for filling with lemonade and ice water. It serves as an ideal daily companion for travel, office, school, home, sports, and outdoor camping. Your satisfaction is our top priority. We are committed to providing the best service. If you encounter any issues after receiving the product, such as damage or incorrect quantity, please contact us immediately for the best solution!