Vacuum Insulated - The insulated 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, reducing the transfer of temperature and adding even more insulation to your water bottle. Easy to Carry Straw Lid - Built for easy drinking on the go, the with straw lid is leak proof when the nozzle is in the closed position. The new Straw Lid makes the water bottle so easy to take with you no matter where you go, and the straw top means no risk of spillage. 2 Lids Available - The wide mouth makes it easy to clean, and the BPA-free lid. The two lids can be switched at any time - the Spout Lid is perfect for the beach and camping, while the flex straw lid is suitable for cycling and road trips.