The 30oz IBEX Tumbler is over-engineered with double wall vacuum insulated food-grade stainless steel sure to keep hot drinks hot and cold drinks cold. It even holds ice frozen for up to 72 hours -- far longer than any of them "other guys". IBEX Tumblers are stronger than anything else available, it's durable and long lasting. Whether fishing, camping, driving, or even watching the kids at the soccer field, The IBEX Tumbler is the perfect solution to keep your drinks the perfect temperature for longer. Stop tossing your drinks out and enjoy them all day long with the 30oz IBEX Tumbler.