The Summit Water Bottle is made of stainless steel and features double-walled, vacuum-sealed insulation. This results in long-lasting temperature control for your drink. The 14oz bottle has a wide-mouth opening and includes a straw lid that can be flipped up for easy drinking. The lid is also leak-proof when closed. It is important to note that the straw lid should not be used with hot liquids. Additionally, the straw lid is compatible with all sizes of the Summit Bottle due to the consistent width of the bottle's opening. This bottle is the perfect size for kids!