The Iron Flask 24 oz Nomad Tumbler is a double-walled dynamo that keeps you hydrated (or caffeinated) and ready for whatever your day throws at you, with cold drinks staying cold for 18 hours and hot drinks staying hot for 4 hours. Every insulated tumbler is made with high-grade, non-toxic 18/8 stainless steel, so it never rusts and your beverage never tastes like it has spare change soaking in it. And for those who like to drink sans spills, we’ve included a leak-proof flip lid for hot bevvys and a splash-proof straw lid with two straws for everything else.