HIGH QUALITYMade of food grade 304 stainless steel inside wall, BPA-free PP plastic stopper, the stopper bottom has silicone ring to ensure sealing and leak proof, bottle outlayer is made of stainless steel and environmentally friendly paint, which is beautiful and does not rust.<br> KEEP DRINK HEAT & COLD FOR HOURSKept warm for about 12 hours; at a room temperature of about 24 C, fill it with hot water of 100 C, After 6 hours about 75 C. After 12 hours and about 46 C. Also, recommended to preheat with boiling water before each use.<br> TOP LID IS SERVING CUP Top lid can be use as an 150ML serving cup, when you drink hot beverage, use this serving cup can fast lower the temperature.<br> ONE BUTTON SWITCH STOPPER Airtight stopper designed with one PUSH button to control the bottle mouth open and close, 360 degree pour water make it more easier to use. The stopper component also can be separate to meet the daily cleaning. Each bottle contains a sponge brush as a gift.<br> MEDIUM CAPACITY410ML / 540ML two capacity can be selected, lightweight and easy to carry. Our stainless steel water bottle is suitable for daily use,such as school or company, travel,camping,beach,hiking and biking etc,bring it as a daily companion to help you stay healthy and hydrated.<br> Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Minnanxin