You might have a different name for them. According to wikipedia
" The beer koozie (pronunciation: /ˈkuËzi/ koo-zee), "beer hugger",[1] or "beer huggie",[1] is a misnomer as it is not always used for an alcoholic beverage. Other names are "coastie",[citation needed] "cozy",[1][3] "coosie",[4] "coolie",[1] "coldy-holdy",[1] "can cooler",[1] "bawdle",[1] "beer sleeve",[citation needed] and "bottle jacket". In Australia it is called a "stubby holder" due to the shape of the 375 millilitres (13.2 imp fl oz; 12.7 US fl oz) bottles of beer being shorter and fatter compared to the more slender 330 millilitres (12 imp fl oz; 11 US fl oz) bottles. "
A Koozie is normally a fabric or foam device that is designed to thermally insulate a beverage can or bottle. You can do the same thing using other things as well. They are pretty common here in the states and are generally used to keep beer and soft drink cans colder longer.
DW