This is a Kinto tumbler. It's been about 5 years since I bought it. It keeps things hot and cold without any problems. Please be aware that there might be some concerns about odors or the condition of the inside. I haven't done any special cleaning, so there's a possibility it could be improved. From the following website: 【Rich Aroma, Comfortable Temperature, Deliciousness Even Outdoors】 The vacuum-insulated TRAVEL TUMBLER is a tool for people who have a flexible lifestyle while still being particular about things. You can enjoy the original flavor of drinks like single-origin coffee, tea, and mineral water for a long time. 【Stress-Free Drinking Experience】 Aiming for a natural drinking experience like a glass or mug, we eliminated protrusions like screws to create a smooth mouthfeel and designed it so you can drink from any 360-degree angle. It has a structure that catches ice and prevents the drink from coming out too quickly, so you can comfortably drink it to the end. 【Excellent Heat and Cold Retention】 The bottle body has a double-walled stainless steel construction. By creating a vacuum between the outer and inner walls, heat loss due to convection is prevented, and high heat and cold retention is achieved. It maintains heat above 65°C and cold below 8°C for 6 hours, allowing you to refresh yourself at a delicious temperature anytime. Furthermore, it's designed to prevent dust from entering even when the lid is removed, so you don't have to open and close the lid every time you drink, which won't interrupt your work. 【Durable and Tough Materials】 We paid attention not only to ease of use but also to the materials and texture so that you can use it for a long time. The bottle body uses 18-8 stainless steel, which is rust-resistant and highly durable, and the colored surfaces are powder-coated to prevent scratches. 【Clean Surface Finish】 Made of high-quality stainless steel, you can enjoy the original aroma of your drinks. In addition, the inside of the bottle is electropolished to create a smooth surface, making it difficult for odors and tea stains to stick, so you can use it cleanly.