Mad Gringo provides fans this great product that allows you to quaff your beer with a warm hand – just twist off “The Mad Cannery” lid and drop in your favorite standard-sized can (sorry, skinny can lovers) and Viola, instant insulation.  And “The Mad Cannery” can also, reputedly, be used with standard sized beer bottles, as well.
A thorough testing protocol may be in order to test the veracity of this last claim – I’ll get back to you...