With a comfortable flexible handle the closeable leakproof straw cap is easy to open and close with one hand for on-demand hydration. Double-wall insulation keeps drinks cold up to 24 hours for cool refreshment. The insulated bottle easily fits ice cubes and is dishwasher safe.24 hours cold. Temp. Shield double-wall vacuum insulation. Leakproof when closed. Pure taste no flavor transfer. Wide Mouth opening is ice-cube friendly. Flex Straw Cap not intended for use with hot liquids. Not for use on a stove in a microwave or freezer.