Tumbler is the name of the cup, not your drunk ass stumbling all over the muster field. 
This baby will keep your favorite beverage cold and enjoyable for hours... but we all know that most drinks won't last > 10 minutes.  Lets rephrase... you'll conserve on ice! 
.: Stainless steel
.: 20oz (0.59 l)
.: Rounded corners
.: See-thru plastic lid