The double wall vacuum insulated walls give you a worry-free mind knowing your beverages are kept icy cold or piping hot for hours. These FIFTY/FIFTY bottles were designed with the little ones in mind, at 12oz they are the perfect size and shape. All bottles include an easy sip straw cap with handle and feature double wall vacuum insulation technology to keep their drink the perfect temperature. Our kids series of bottles are made out of 18/8 food grade stainless steel and don't leach, retain tastes or odors. All these features make this bottle the perfect bottle for your little one.