a simple cylinder of foam rubber it invented an advertising space where previously there had been none ( stubbie holders in australia were like hand-held billboards , printed with any one of a million or more different business , sports and/or charity logos seeking publicity ) , it provided noticeable insulation against the ambient heat and kept the cans , glasses or similarly dimensioned small , brown bottles of veebee , fourexed or floisters slightly colder for fractionally longer .