HIGH-QUALITY MATERIAL: The leak-proof 410ml coffee mug is made of food-grade 316 stainless steel, and the outer shell is made of high-quality grade 201 stainless steel. Robust, corrosion-resistant, safe, and healthy. It is FDA-approved for your drinking needs. Naturally 100% BPA-free. LEAK-PROOF & LONG HEAT RETENTION TIME: This travel mug is highly leak-proof, so don't worry about it leaking when you carry it in your bag/backpack or hold it in your hand while walking. Our mugs keep liquids hot above 42C for up to 6 hours and cool below 10C for up to 5 hours. This is longer than other vacuum flasks. SMART LID: The mug lid features a smart temperature indicator. A simple touch of your finger is all it takes to check the temperature of your drinkconvenient and practical. Each time you press the cup lid, the temperature is displayed for 3-4 seconds and then switches to invisible energy-saving mode. The next time you touch it, the display will reappear. VERSATILE: Thanks to the latest double-walled vacuum technology, this travel coffee mug is stylish and full-bodied. Whether traveling, at home, in the office, or outdoors, it's the ideal companion. Simple and practical, it's the best birthday and Christmas gift for friends, family, children, sons, and daughters. Tips: 1. The cup lids have a protective plastic film on the surface. REMOVE THIS. 2. DO NOT soak the lid in water when cleaning. Specifications: Color: Brown Size: 16.5 x 8 cm Material: 316 stainless steel Capacity: 410 ml Package includes: 1 x Thermos mug 1 x Carrying strap 1 x User manual