The double-wall vacuum-insulated walls give you a worry-free mind knowing your favorite beverages are kept icy cold or piping hot for hours. Made of lightweight 18/8 food-grade stainless steel that is non-leaching and will not retain taste or odor. The double-wall technology prevents condensation on the outside for those hot sunny days while keeping the heat within the inner wall so you dont have to worry about burning your hand. The 18oz bottle is the optimal size to use as your everyday water bottle and designed to fit in your backpack and most car cup holders. The vacuum-insulated walls ensure when you fill it with your ice-cold water in the morning it will last until your next refill. The double-wall technology prevents sweating on the outside of the bottle, so you dont have to worry about it slipping out of your hand on your afternoon run. The 18oz bottle includes a wide mouth leak-proof 3-finger grip lid. The silicone ring ensures a snug fit to the top of the bottle to retain your beverages optimal temperature and is easily removable for proper cleaning. The lid is made to easily screw off and on your bottle and its 3-finger design gives it a comfortable feel when carrying it around with you wherever you go.