Bottle is made from premium gauge 18/8 stainless steel and is powder coated in a durable matte finish.. The exterior of the vacuum sealed area is dipped in copper for added insulation. Copper reduces the transfer of temperature, adding even more insulation to your bottle.The design of the dust cover has been added.using the dust cover to open the nozzle is easier than the traditional opening method, the dust cover can effectively prevent dust from entering, and avoid touching the nozzle by hand, which is more convenient and sanitary. Wide mouth makes it easy to clean, BPA-free lid which means they are very safe.2 lids can be switched at any time, Matching of different colors to suit different occasionsTake this easy to carry portable water bottle while hiking,